For MLB catching prospects, a stolen base is a violent, two-second race against the stopwatch. A runner breaks for second, spikes tear through the dirt, and the catcher has barely enough time to react. The baseball smacks into his mitt. His throwing hand flashes forward. By the time the ball reaches second, the runner might already have his fingers on the bag.
Nobody cares how hard the throw travels if the runner beats the tag.
That’s the problem facing scouts who spend years searching for the next great defensive catcher. A powerful arm can turn heads during workouts. But a clean transfer, quick feet, and an accurate release often decide what happens when someone actually tries to steal.
Consider Samuel Basallo, whose throwing arm earned a 70-grade evaluation from Baseball America entering 2026. Then consider Joe Mack, whose quicker exchange helped him produce a faster average pop time despite throwing with less velocity.
Both possess legitimate defensive talent. Their contrasting results reveal why evaluating the throwing arms of elite MLB catching prospects requires more than a radar gun.
The question isn’t simply who throws hardest. It’s who can get the baseball to second base before the runner arrives.
Baseball’s stolen-base revival has raised the stakes for young catchers
Stealing second became more attractive after MLB changed its rules in 2023. The league expanded the bases from 15 to 18 inches and limited pitchers to two disengagements per plate appearance. A third unsuccessful pickoff attempt now results in a balk.
Aggressive runners gained another advantage against pitchers with slow deliveries. A strong catching arm still mattered, but it couldn’t erase every mistake made on the mound.
Baseball’s modern running game punishes hesitation.
A catcher must recognize the runner’s intentions before the pitch arrives. He watches the lead, prepares for a potential break, and positions his body to receive the ball without compromising his throw.
Sometimes the runner gets an excellent jump. Other times, a breaking ball lands near the dirt and forces the catcher to reach outside his frame. Either situation can steal valuable time.
The best young backstops understand that their work begins before the baseball touches leather.
Pop time measures the race that matters
According to Baseball Savant’s Statcast pop-time leaderboard, the major league average pop time to second base sits around 2.00 seconds. The clock starts when the pitch hits the catcher’s mitt and stops when his throw reaches the fielder’s projected receiving point.
Three movements shape that number. The catcher transfers the ball from glove to hand, releases it, and sends it toward second. His exchange speed and throwing velocity determine how quickly the ball arrives.
Look at veteran catcher Patrick Bailey. His 2026 Statcast numbers included a 1.85-second average pop time and a 0.59-second exchange. Bailey didn’t need to overpower every throw. His quick hands helped him eliminate precious fractions of a second. baseballsavant.com
A catcher with a stronger arm can lose that advantage if the baseball spends too long trapped between glove and hand.
Even an excellent pop time can deceive scouts. A rushed throw might drag the shortstop toward center field, leaving the runner safe despite an impressive stopwatch reading.
Velocity tells scouts how hard a catcher throws. Pop time shows how quickly he completes the play. Accuracy reveals whether the throw actually gives his infielder a chance.
Samuel Basallo has the cannon but his exchange needs work
Few young catchers have reached the majors with more impressive throwing tools than Samuel Basallo.
Baseball America’s January 2026 catching prospect rankings gave Basallo a 70-grade arm on the traditional 20–80 scouting scale. MLB Pipeline also identified him as the strongest-armed catcher among its leading prospects.
His physical strength made him one of Baltimore’s most intriguing young defenders. But that cannon hasn’t always translated into control of the running game.
An August 2025 Baseball America evaluation uncovered the problem. At Triple-A Norfolk, Basallo had caught just six of 47 attempted basestealers, a 12.8 percent success rate.
The report also recorded an average pop time of 1.98 seconds and 83.9 mph throwing velocity. His arm generated plenty of speed, but his mechanics occasionally wasted the advantage.
Baseball America identified a specific weakness. Basallo sometimes secured the pitch before shifting his body into throwing position. Quicker catchers often prepare their throwing motion while receiving the baseball. Baseball America
That extra movement can cost several hundredths of a second.
His first major league stint told a different story. Basallo caught five of 13 attempted basestealers in 2025, a 38 percent success rate. The Triple-A sample came from a larger stretch earlier that year, making the contrast worth examining rather than celebrating.
The same arm produced wildly different results.
By the end of 2026, Statcast had measured Basallo’s major league throwing performance across 37 tracked attempts at second base. He posted 87.8 mph arm strength, a 0.71-second exchange, and a 1.92-second average pop time. baseballsavant.com
The velocity jumps off the page. His exchange shows where he can improve.
At 6-foot-4, Basallo must coordinate long limbs through a compact, explosive movement. His frame creates excellent throwing leverage, but it also demands precise timing.
A slight delay between catching and throwing can swallow the advantage his arm creates.
Basallo doesn’t need another few miles per hour. He needs to get his existing arm into the play sooner.
Joe Mack proves that quick hands can neutralize elite speed
While Basallo attracts attention for raw power, Joe Mack has built his defensive reputation around efficiency.
The Marlins catcher entered 2026 with a 65-grade arm from Baseball America. He also possessed quick hands, agile footwork, and the receiving ability that helped him earn a Minor League Gold Glove in 2024.
On May 9, 2026, Mack showed those skills against Washington.
CJ Abrams broke for second base. Mack secured the pitch and fired toward the bag. The umpire initially ruled Abrams safe, but replay overturned the call.
According to MLB’s report on the play, Mack delivered a 1.93-second pop time on an 80.2 mph throw. The ball arrived in position for the tag, even without extraordinary velocity.
Mack didn’t need an exaggerated throwing motion. His hands worked quickly, his feet followed, and the baseball reached second before Abrams could complete the steal.
One clean sequence decided the play.
By August 13, Mack had turned that efficiency into a remarkable defensive stretch. MLB reported that he had caught 19 runners stealing since his May 4 debut, the highest total in the majors during that span. MLB.com
His completed 2026 Statcast numbers made the comparison with Basallo even more revealing.
Mack averaged a 1.89-second pop time, supported by 83.3 mph arm strength and a 0.60-second exchange.
Basallo threw harder, but Mack transferred the baseball 0.11 seconds faster on average. That quicker exchange helped him finish with a pop time 0.03 seconds better.
Three-hundredths of a second sounds insignificant until a runner slides into second with the shortstop’s glove chasing his fingertips.
Mack’s success also reflects his consistency. He can repeat his movements without rushing his release or sacrificing accuracy. That skill makes an above-average arm considerably more dangerous.
A scout watching these two catchers faces a fascinating decision. Basallo offers greater throwing power and physical upside. Mack already demonstrates how quickly a disciplined catcher can complete the entire motion.
The numbers favor different tools. The running game demands they work together.
Carter Jensen proves that exceptional pop times don’t guarantee outs
Carter Jensen presents another difficult scouting puzzle.
The Royals catcher arrived in the majors with considerable offensive potential and a strong throwing arm. Yet his minor league caught-stealing numbers didn’t always match the quality of his physical tools.
At Triple-A Omaha in 2025, Jensen flashed the kind of release that makes scouts reach for their stopwatches. He could get the baseball from his mitt to second base in as little as 1.81 seconds, according to MLB Pipeline’s September 2025 scouting report.
That’s exceptional speed. The trouble came when opponents challenged him repeatedly.
For all that quickness, Jensen caught just 15 percent of attempted basestealers at Omaha. Runners kept finding their way into scoring position despite his ability to deliver a remarkably fast throw.
A catcher can deliver a perfect strike and still lose the race. If his pitcher takes too long to reach home plate, even the best pop time might not save the play.
Jensen’s 1.81-second mark represented a reported best, not his average across every attempt. Still, it revealed the speed hiding inside his mechanics.
During 2026, major league runners offered a tougher examination. Jensen had to gather pitches, transfer the ball, and release his throws while facing the quickest players in baseball.
Statcast measured his exchange at an average of 0.66 seconds. Once the baseball left his hand, Jensen generated 84.1 mph arm strength. Across 29 tracked attempts at second, those movements combined for an average pop time of 1.90 seconds. baseballsavant.com
The stopwatch confirmed that his arm belonged at the major league level. But Jensen couldn’t rely on speed alone.
One difficult pitch can expose a sloppy exchange. A rushed release can send the baseball several feet off target. Even a clean throw might arrive late if the runner gets an exceptional jump.
Those situations test more than physical talent. They reveal whether a young catcher can maintain his mechanics when everything around him starts moving faster.
For Jensen, development means turning his quickest throws into something he can repeat throughout a game. The 1.81-second flash showed his ceiling. His everyday work behind the plate will determine how often he approaches it.
Ethan Salas and Rainiel Rodriguez face different tests behind the plate
Two of baseball’s youngest catching talents illustrate how differently strong throwing arms can develop.
Ethan Salas entered 2026 with a reputation for advanced receiving skills and polished mechanics. Baseball America’s preseason evaluations awarded him a 60-grade arm and a 70-grade fielding tool.
Salas built his defensive reputation around more than throwing velocity. His receiving technique, quick hands, and understanding of the position helped him stand out against older competition.
In September 2026, San Diego promoted Salas to the majors after a productive stretch at Triple-A El Paso. MLB reported that he batted .326 with a .949 OPS during his final month in the minors. MLB.com
The promotion gave Salas an opportunity to test his defensive skills at the highest level.
His challenge differs from Basallo’s. Rather than maximizing extraordinary arm strength, Salas must prove that his complete defensive approach can handle major league speed.
Rainiel Rodriguez, meanwhile, offers St. Louis a different kind of catching prospect.
Rodriguez entered 2026 with a 60-grade arm from Baseball America. His offensive power attracted much of the attention, but the teenager also spent plenty of time testing that arm against aggressive runners.
On September 12, Rodriguez delivered another caught stealing for Double-A Springfield. It was his 27th of the season, another runner who had challenged the young catcher’s throwing ability and failed.
By then, opponents had attempted 101 steals against Rodriguez across his minor league stops. He had cut down 27 of them, leaving his caught-stealing rate at 26.7 percent.
The figure appeared in MLB’s September 13 report, which also detailed Rodriguez’s remarkable offensive production. He had already made 66 starts behind the plate across two levels while building one of the most exciting hitting profiles in the minors.
His throwing arm deserved attention alongside the home runs. MLB.com
Still, Rodriguez’s 27 successful throws tell only part of the story. Scouts need to see how quickly he gets rid of the baseball when a pitch misses its target. They also need to know whether his accuracy holds up against runners with better jumps.
The demands will only increase as Rodriguez climbs through the minors. Faster runners will expose slow transfers, inaccurate releases, and the occasional moment of hesitation.
Salas and Rodriguez may become very different major league defenders. One leans on polished technique, while the other brings impressive physical strength.
Both still need to turn those advantages into dependable outs.
Caden Bodine shows why anticipation can compensate for average arm strength
Caden Bodine offers another compelling example of how quick hands can narrow the gap between ordinary and exceptional throwing tools.
Baltimore selected the Coastal Carolina catcher with the 30th overall pick in the 2025 MLB Draft. The Orioles later sent him to Tampa Bay on December 19, 2025, as part of the package that brought pitcher Shane Baz to Baltimore.
Baz had originally joined the Rays in August 2018 through the Chris Archer trade with Pittsburgh. The December 2025 deal was a separate transaction, seven years later, involving Bodine and three other prospects.
MLB’s official trade report confirms the move, giving Bodine an early change of organizations before his first full professional season.
His arm strength has never defined his scouting profile. Instead, quick hands, anticipation, and throwing accuracy have carried greater weight.
FanGraphs’ 2026 Rays prospect evaluation described Bodine as an accurate thrower with roughly average arm strength. His observed pop times generally ranged between 1.95 and 2.00 seconds.
Those figures don’t match the quickest arms in professional baseball. Yet Bodine offers a useful reminder that receiving and throwing must work as one movement.
His preparation starts before the pitch reaches his glove.
When a runner takes an aggressive lead, Bodine must recognize the possibility of a steal and prepare his throwing position. A fastball near the chest offers a relatively straightforward exchange. A breaking ball outside the strike zone creates a much tougher assignment.
Quick hands allow him to limit wasted movement. Reliable accuracy gives his infielder a chance to finish the play.
Bodine still has room to improve, especially when receiving borderline pitches. His caught-stealing results have also lagged behind the quality of some of his individual throws.
For a developing catcher, that combination provides a clear set of priorities. Bodine doesn’t need to become the hardest thrower in Tampa Bay’s system. He needs to keep refining the movements that make his existing arm effective.
The best throwing arms still fail when accuracy disappears
A 90-mph throw that sails into center field accomplishes nothing. Neither does a rushed delivery that forces the shortstop to dig the baseball out of the dirt.
The fastest catchers understand that every movement must serve a purpose.
Some young backstops rush their footwork, open their shoulders too early, or release the ball before establishing balance. Their throws might look spectacular on radar guns, but the baseball arrives several feet away from the bag.
Others sacrifice a little velocity to maintain control. Those throws rarely attract the same attention, yet they consistently reach an infielder in position to make the tag.
Pitch selection complicates the equation.
A high fastball can provide a clean throwing lane. A slider that dives toward the dirt forces the catcher to secure the baseball before starting his exchange.
The runner knows those differences, too. An aggressive basestealer might anticipate a breaking ball and take off before the pitch reaches home plate.
Catching prospects must respond without letting their mechanics collapse.
The smartest scouting evaluations separate the catcher’s decisions from circumstances beyond his control. Pitcher delivery times, runner jumps, and throw accuracy all shape the final outcome.
A catcher who throws out only a modest percentage of runners might still possess exceptional mechanics. Another can post impressive numbers while benefiting from pitchers who consistently hold runners close.
Watching the full play tells scouts far more than studying the final percentage.
The next generation must win the race before the ball leaves the glove
Evaluating the throwing arms of elite MLB catching prospects will continue to change as tracking technology exposes the smallest details of defensive performance.
The 2026 season offered a revealing contrast between physical strength and mechanical efficiency.
Basallo demonstrated exceptional arm speed but surrendered valuable time during his exchange. Mack turned quicker hands into faster average pop times despite generating less velocity. Jensen showed why outstanding stopwatch readings don’t automatically produce impressive caught-stealing percentages.
Salas, Rodriguez, and Bodine face their own versions of the same challenge.
Every young catcher wants to make the spectacular throw. The best ones learn how to repeat an effective throw when the situation becomes uncomfortable.
Scouts should watch what happens when a pitch pulls a catcher away from his preferred receiving position. Does he recover his balance quickly? Can he maintain accuracy without adding an unnecessary step? Will his release remain compact when a runner forces him to hurry?
Those small details determine whether arm strength becomes a genuine defensive weapon.
A gifted catcher might throw harder than almost anyone in the league. But if he needs too much time to get the baseball out of his glove, major league runners will exploit the opening.
Picture the tying run standing on first in the ninth inning. The pitcher begins his delivery, the runner breaks, and the catcher receives a fastball near the bottom of the strike zone.
There is no time to admire arm strength.
The catcher must transfer the baseball, release it, and put the throw exactly where his infielder needs it. One extra movement could cost the out. A rushed throw could put the winning run in scoring position.
That’s the standard every young backstop eventually faces.
Scouting reports can identify the strongest arms in baseball. Statcast can measure how quickly those arms deliver the ball.
When a runner slides toward second with the game hanging in the balance, though, the radar gun becomes irrelevant.
The catcher has to make the out.
READ MORE: MLB catchers with the fastest pop time in 2026: The era of the steal
FAQs
Q1. What is a good pop time for an MLB catcher?
A pop time around 2.00 seconds is the major league average. Elite catchers can consistently get the ball to second in under 1.90 seconds.
Q2. Why do quick hands matter more than arm strength for catchers?
Quick hands help catchers transfer and release the baseball faster. A powerful arm loses its advantage when a slow exchange gives runners extra time.
Q3. Which MLB catching prospect has the strongest throwing arm?
Samuel Basallo entered 2026 with a 70-grade arm from Baseball America. His arm strength stood out among the game’s leading young catching prospects.
Q4. How fast was Joe Mack’s pop time in 2026?
Joe Mack averaged a 1.89-second pop time in 2026. His quick exchange helped him beat runners despite throwing with less velocity than Samuel Basallo.
Q5. Does a faster pop time guarantee more caught stealings?
No. Pitcher delivery times, runner speed, and throwing accuracy also matter. Even a great catcher can lose the race when a runner gets an excellent jump.
