NBA defensive switching schemes can fall apart in the time it takes a sneaker to squeak across the hardwood. A guard calls for a screen, the opposing center steps forward, and two defenders exchange assignments. One points toward the corner. The other hesitates, and the ballhandler already has a clear path toward the rim.
In that moment, an otherwise forgettable October exhibition becomes a revealing test of everything a coaching staff has spent training camp teaching.
Watch the weak-side corner during a preseason game. While fans follow the ball, an assistant coach might be tracking whether the low defender rotates early enough to protect the basket. Another studies how quickly the center recognizes a slipped screen. Neither cares much about the score flashing above the court.
Coaches don’t just tolerate blown coverages during the preseason. They hunt for them on film, searching for mistakes that could become far more expensive once the regular season begins.
That’s what makes these games valuable. Defensive switching schemes look clean during walkthroughs, when everyone knows the next action. Against an unfamiliar opponent, the communication gets louder, the decisions get faster, and weaknesses emerge.
The real question goes beyond preseason wins. Which lineups can survive the mismatches, spacing, and relentless screens of modern NBA basketball?
Why NBA Exhibition Games Have Become Defensive Laboratories
Training camp offers controlled conditions. Coaches stop drills, reset possessions, and explain exactly where defenders should stand. Players develop familiarity with their teammates, but that comfort can also disguise problems.
An exhibition opponent doesn’t care about the lesson plan. Its guards attack unfamiliar matchups, screeners slip toward the rim, and shooters drift into the corners as defenders scramble to communicate. Suddenly, what worked perfectly in practice looks much less convincing.
For NBA coaching staffs, this creates an opportunity to test defensive switching schemes against genuine resistance. One lineup might switch every perimeter ball screen for several possessions. The next group could use drop coverage, allowing the center to protect the paint while the guard fights over the screen.
This gives coaches something close to a basketball A/B test. They can study which coverage produces cleaner contests, which lineup closes off driving lanes, and whether those defensive stops actually end with rebounds.
The results rarely point toward one perfect answer. Boston learned that lesson while refining a championship-caliber defense. Now, other coaching staffs are confronting different versions of the same problem as they build their identities for the 2026-27 season.
Boston’s Shift from Switching Everything to Protecting the Paint
The Boston Celtics offer a useful example of how sophisticated defenses can become more selective without abandoning switching.
According to NBA.com reporting based on Second Spectrum tracking, Boston switched 40% of opponent ball screens in 2022-23, the league’s second-highest rate. During the following season, that number dropped to 29%, although the Celtics still ranked fourth in switching frequency. Those figures measured switches on ball screens, not the percentage of every defensive possession spent switching.
The change helped Boston keep its bigger defenders closer to the basket. Al Horford’s ball-screen switching rate fell from 28% to 20%, while Kristaps Porzingis switched just 10% of the ball screens he defended. Opponents shot 53.8% in the paint against Boston, down from 56.1% the previous season.
Those figures tell a more interesting story than simply switching less. Joe Mazzulla’s staff could preserve Porzingis as a rim protector instead of repeatedly dragging him toward the perimeter. The Celtics still had the personnel to exchange assignments when necessary, but they stopped treating every screen as the same problem.
Boston was demonstrating a principle that remains central to modern NBA defense. The smartest switch might be the one a defender never makes.
That lesson now stretches far beyond Boston. Some teams are trying to protect their centers, while others are pushing defenders higher up the floor to create turnovers. Both approaches come with risks, and October offers the first chance to discover which compromises are worth making.
The First Test Begins Before the Screen Arrives
Switching defense looks simple from the upper deck. Two defenders trade offensive players, communicate the exchange, and stay in front of their new assignments.
Down on the floor, everything happens faster. A guard notices a screener approaching from his left. His teammate must determine whether the action requires a switch, a temporary hedge, or continued pursuit. Meanwhile, the ballhandler watches their feet, looking for the slightest disagreement.
One late call can ruin an entire possession. That communication challenge affects every team, whether it favors Boston’s selective switching or a more aggressive approach designed to attack the ball.
When the Screener Never Makes Contact
Consider a ghost screen. An offensive player approaches the ballhandler as though preparing to set a pick, then abruptly slips into open space without touching the defender.
If both defenders anticipate a switch, they might momentarily follow the same player. The screener drifts behind the three-point line, catches a pass, and shoots before either defender recovers. Just beyond the arc, the offense has manufactured an advantage without setting a conventional screen.
Kon Knueppel demonstrated the value of that deception during his rookie season with Charlotte. In a February 2026 NBA.com film example against Golden State, Knueppel’s ghost screen helped create separation as LaMelo Ball drew defensive attention. Knueppel slipped into shooting space, and Ball found him for a three-pointer.
The sequence captures why defensive coaches worry about screening actions that never actually happen. Defenders prepare to exchange assignments, and the offense punishes that anticipation.
These actions are particularly useful for testing defensive switching schemes because they expose hesitation rather than a lack of athleticism. A defender might have the speed to recover but still lose the possession by reacting half a second late.
During preseason film sessions, coaches can isolate those mistakes and identify their cause. Did the guard call the switch too early? Was the center watching the ball instead of the screener? Should the defense have stayed with its original assignments? Each answer changes how the team prepares for the next game.
The Mismatch That Makes Coaches Reach for the Remote
Picture Tyrese Maxey, listed at 6-foot-2, suddenly switching onto Nikola Jokic near the nail, around the middle of the free-throw line. Jokic turns, plants his feet, and starts walking the smaller defender toward the basket.
Maxey might fight for position, but the size disadvantage creates an obvious problem. A teammate must help before Jokic establishes deep post position, preferably without leaving an open three-point shooter.
One possible solution is a scram switch. A larger defender rotates toward Jokic while Maxey escapes to a less dangerous assignment. The defense has effectively switched again to repair the mismatch created by the first exchange.
NBA.com’s film analysis of Brooklyn’s earlier switch-heavy defenses documented precisely this maneuver. The Nets used players such as Kevin Durant to rescue Kyrie Irving from unfavorable interior assignments, sometimes completing the exchange before the offense could exploit it.
One sequence against New Orleans in April 2021 offers a particularly clear example. Jeff Green switched a screen, leaving Irving responsible for Willy Hernangomez. Before Hernangomez could establish deep position, Durant rotated away from James Johnson and took over the matchup.
For coaching staffs, these possessions reveal whether players understand the second and third actions of a defensive scheme. Winning the initial exchange means little if the offense immediately exploits the matchup it creates.
Small-Ball Lineups Change the Entire Shape of the Floor
Removing a traditional center can make switching easier. It can also turn defensive rebounding into a fight.
Imagine a lineup with five mobile defenders, each capable of following an opposing guard beyond the three-point line. When a screen arrives, the defense exchanges assignments without forcing anyone into a frantic sprint back toward the basket.
The paint looks almost empty. Wings extend higher toward the perimeter, and a forward who normally protects the rim now stands several feet beyond the arc, confronting the ballhandler. That spacing can prevent the offense from developing its preferred advantage.
Unfortunately, the same alignment creates another problem. When the shooter releases the ball, the defense must recover toward the basket and find bodies to box out. A strong offensive rebounder can punish a team that switches beautifully but leaves itself physically overmatched.
A fast, switch-heavy lineup might blow up passing lanes and still get bullied on the glass.
Why Personnel Matters More Than the Playbook
Defensive switching schemes depend on the players carrying them out. A versatile forward might handle guards, wings, and smaller centers. A traditional rim protector could dominate the paint but struggle when an opponent repeatedly forces him into isolation.
Consider Brook Lopez, whose defensive value has long centered on protecting the rim through drop coverage. Asking a center with that profile to switch onto a quick guard creates a completely different test from keeping him near the restricted area.
Coaches use exhibition games to discover how often their big men can handle those assignments without sacrificing what makes them valuable.
Young wings face another challenge. They might have the length and lateral speed to defend several positions, but switching demands anticipation as much as physical ability. Missing one backdoor cut or losing a shooter in the corner can undermine an otherwise impressive defensive sequence.
That’s why preseason rotation battles often involve far more than scoring. If a fringe rotation player nails two difficult switches, makes the correct weak-side rotation, and secures the rebound, he gives the staff another reason to trust him.
Boston’s earlier adjustments showed what a staff can accomplish with an established defensive core. In Los Angeles, the current preseason presents another challenge: teaching a revamped group to pressure opponents without leaving the basket exposed.
The Lakers’ October Defense Shows What Preseason Can Reveal
The Los Angeles Lakers’ 2026 preseason opener against Sacramento offered an early look at a team trying to establish a more aggressive defensive identity.
Los Angeles beat the Kings 127-103 on October 5, forcing 26 turnovers. Under JJ Redick, the Lakers pressured ballhandlers, switched assignments, and used their athletic wings to disrupt Sacramento’s offense.
While Boston’s earlier adjustment focused on keeping its big men near the paint, Los Angeles has been experimenting with creating problems farther from the basket. The approaches look different, but both force coaches to answer the same question: what happens when the opponent escapes the first line of defense?
An October 8 film breakdown from Silver Screen and Roll described Redick’s commitment to full-court pressure and defensive versatility. Ziaire Williams and Matisse Thybulle helped establish that approach, while Quentin Grimes and other perimeter defenders contributed to the disruption.
The Lakers recorded 15 steals against Sacramento, significantly above their previous season’s average of 8.5 per game. Redick praised the team’s defensive activity, and the turnover numbers gave his staff encouraging evidence that their work in training camp was translating into games.
Still, those numbers require careful interpretation. Los Angeles forced turnovers through a combination of ball pressure, aggressive rotations, and defensive activity. Its 26 takeaways cannot be credited specifically to switching. Sacramento also scored 52 points in the paint, leaving the Lakers with questions about their protection behind the perimeter defenders.
That’s the exact trade-off Boston spent years learning to manage. Pull defenders away from the basket, and the opponent might find room inside. Keep everyone closer to the paint, and skilled guards can find cleaner looks from outside.
For Redick, the preseason offers a chance to experiment with that balance before opponents begin targeting the same weakness possession after possession.
And the lesson travels. Whether a team emphasizes pressure or protection, the next step involves studying what happened after the initial defensive action.
Why Coaches Study the Possessions Nobody Remembers
A defensive possession can succeed without producing a steal, blocked shot, or spectacular highlight.
Suppose two defenders switch cleanly against a high pick-and-roll. The ballhandler retreats, tries another angle, and eventually passes to a teammate who takes a contested jumper late in the shot clock.
The shot falls.
From the box score, the defense surrendered two points. On film, the coaching staff might still approve of nearly everything that happened because the scheme prevented the offense from generating its preferred look.
Now consider the opposite situation. A defender misses the initial switch, scrambles toward the paint, and blocks the resulting layup against the backboard.
The crowd loves it. His coach might not.
The Numbers Behind the Eye Test
Evaluating defensive switching schemes requires a closer look at what happens between the screen and the shot.
Coaches can examine how frequently opponents reach the paint, whether switches create unfavorable post matchups, and how quickly help defenders recover to shooters. They can also study defensive rebounding and fouling, two areas where overaggressive switching can create costly problems.
Yet preseason statistics come with obvious limitations. Opposing stars might play only one half. Rotations change throughout the night, and a lineup facing reserves can produce impressive numbers without proving much against NBA starters.
A defensive rating compiled from a handful of exhibition possessions cannot settle a season-long tactical debate. That’s why coaches return to the tape.
Hours later, after the locker room empties, assistants can replay the same possession several times. One watches the ball screen. Another studies the weak-side help. A third checks whether the final rotation left someone unaccounted for.
The important question isn’t simply whether the opponent scored. Coaches want to know whether the defense forced the shot it intended to allow.
For teams with established systems, that film can reveal which adjustments need attention. A new coaching staff faces an even bigger challenge. It must teach an entire roster which shots to concede, which matchups to avoid, and how five defenders should react together.
That’s where New Orleans enters the league-wide experiment.
Jamahl Mosley’s New Orleans Challenge Begins With Defensive Trust
Where Boston refined an established system and Los Angeles began exploring more disruptive pressure, the New Orleans Pelicans are working under a coach determined to establish defensive accountability from the beginning.
Jamahl Mosley, introduced as the Pelicans’ head coach in May 2026, arrived with a reputation for building physical, connected defensive teams in Orlando.
At his introductory press conference on May 26, Mosley made his priorities clear.
“We’re going to do it defensively,” he told reporters.
Coverage of the press conference highlighted Mosley’s emphasis on understanding assignments, individual accountability, and competitive pride. His Orlando teams finished among the NBA’s top three in defensive rating in two of his final three seasons there.
That background makes New Orleans an interesting setting for testing defensive switching schemes.
Mosley has Herb Jones, one of the league’s most respected perimeter defenders, available to anchor a defense built around length and anticipation. His task involves turning individual versatility into coordinated team coverage.
The distinction matters. Jones can disrupt a ballhandler without much help. But when the Pelicans switch across multiple positions, the other four defenders must recognize which angles have opened and who needs support.
Mosley has discussed those demands before. In a December 2024 NBA Coaches Corner segment, while coaching Orlando, he demonstrated the importance of switching both on and away from the ball.
His broader message remains straightforward: switching isn’t a two-man game. All five defenders must instantly adjust to the new angles.
That connects New Orleans to the same questions confronting Boston and Los Angeles. Personnel determines which matchups a team can survive, while communication determines whether its preferred coverage actually works.
For Mosley, the challenge begins with building trust between defenders who must make those decisions together.
The Hardest Decisions Come When Opponents Fight Back
Opposing offenses rarely accept a defensive switch without trying to punish it.
Once a team develops a recognizable switching pattern, skilled playmakers begin manipulating that habit. They call for screens from particular teammates, force smaller defenders onto bigger scorers, and clear one side of the floor to create isolation opportunities.
Luka Dončić and Nikola Jokic make those choices particularly dangerous because both excel at reading the defense before the action develops.
A team switching automatically against Jokic might discover that he has already identified the smaller defender he wants near the basket. Against Dončić, a slow-footed big man caught on the perimeter can surrender enough space for a step-back jumper or a drive.
The answer often involves disguise.
A defense might pre-switch before the screen arrives, keeping its weakest matchup out of the action. Another possession could feature a late switch designed to prevent the ballhandler from predicting the coverage.
These adjustments create their own complications. Defenders must communicate without revealing everything to the offense, and any hesitation can produce the very mismatch they intended to avoid.
Exhibition games let coaches discover how much tactical complexity their players can realistically handle.
Boston’s experience demonstrates why having several coverages matters. The Lakers’ early experiments show how aggression can create turnovers while placing extra demands on the back line. In New Orleans, Mosley must find ways to make those same defensive responsibilities second nature to his players.
Different personnel, different starting points, but the same underlying problem.
Sometimes, the simplest coverage executed five times correctly beats a complicated defense that breaks down once.
What These October Experiments Mean for the Regular Season
By the final week of preseason, coaching staffs need more than a collection of interesting defensive ideas. They need dependable rules their players can follow when the game speeds up and the opponent starts hunting matchups.
The most useful defensive switching schemes will give teams options rather than force the same response to every screen. Against a quick guard, a switch might prevent the ballhandler from turning the corner. Facing a powerful center, the smarter choice could involve keeping a bigger defender near the basket and sending the guard over the screen.
Those decisions depend on personnel, and October helps coaches discover their limits.
Boston’s earlier defensive evolution provides one model for balancing versatility with rim protection. Redick’s Lakers are exploring whether relentless pressure can disrupt opponents without creating too many openings inside. Mosley’s Pelicans face the foundational task of turning individual defensive talent into coordinated team execution.
None of those approaches comes with a guarantee. Their success depends on how consistently five players make the correct decisions together.
A young forward might earn minutes because he recognizes when to exchange assignments. Another player could lose ground in the rotation after repeatedly missing weak-side responsibilities. Even established veterans need time to adjust when new teammates arrive or the coaching staff changes its defensive priorities.
The film also reveals which combinations fit together. A switch-heavy lineup could provide excellent perimeter resistance but struggle against offensive rebounding. Pairing those defenders with a reliable rim protector might solve one problem while reducing the team’s ability to exchange every assignment.
Coaches have to find the balance before opponents discover the weakness for them.
There will be more possessions when two defenders point at each other after an open three. More big men will get stranded near the arc against quicker guards. Some experiments will disappear from the playbook before the opening regular-season tip.
Others might become the foundation of a team’s defensive identity.
Finally, when the games begin to matter, those experiments will face their real examination. The arena will get louder, the rotations will tighten, and opposing stars will keep attacking the same weak point until somebody fixes it.
A screen will arrive. Two defenders will exchange assignments. Somewhere behind the play, a third defender will recognize the danger and move before the pass leaves the ballhandler’s hands.
Most fans won’t remember that possession.
But if the switch works, the coaching staff might remember exactly where it began: during an October exhibition that nobody cared about winning.
READ MORE: New roster, new rules: How the Bulls must fix their switching defense
FAQs
Q1. Why do NBA coaches test defensive switching in preseason games?
Coaches use exhibition games to identify missed assignments, test different lineups, and see how defenders communicate against unfamiliar opponents.
Q2. What is a ghost screen in NBA basketball?
A ghost screen happens when a player pretends to set a pick, then slips away before contact to create an opening.
Q3. What is a scram switch in NBA defense?
A scram switch allows a larger defender to replace a smaller teammate caught guarding a dangerous interior matchup.
Q4. Why don’t NBA teams switch every ball screen?
Switching can create mismatches and pull rim protectors away from the basket. Coaches sometimes prefer drop coverage to protect the paint.
Q5. How do NBA coaches evaluate defensive switching schemes?
They study game film, opponent shot quality, paint penetration, communication mistakes, and defensive rebounding rather than relying solely on the final score.
