Postseason exit velocities can make a 116-mph rocket look like a failure. In the second inning of Game 6 of the 2025 American League Championship Series, Vladimir Guerrero Jr. hammered a ground ball toward third base. Seattle’s Eugenio Suárez dove across the dirt, stopped it and threw to second from his knees for the forceout. Guerrero had absolutely smoked the baseball. He had nothing to show for it.
Three innings later, the Blue Jays slugger caught a hanging curveball from Logan Gilbert and drove it 384 feet into the left-field seats. That home run registered 102.6 mph, considerably slower than his earlier grounder. Yet the second swing helped Toronto extend its lead in a game it needed to win.
Jay Jaffe documented both plays in his FanGraphs analysis of Guerrero’s postseason. The 116-mph grounder was Guerrero’s hardest-hit ball of that postseason through Game 6, but the defense erased it. After 162 regular-season games, every struggling October hitter faces the same suspicion. Is he tired, or has the pitching simply gotten better?
Postseason exit velocities offer clues, but they cannot settle that argument alone. A hitter can lose timing without losing strength. He can also square up a baseball while struggling physically. Sometimes the most revealing part of the swing happens before contact.
October pitching changes the equation
Consider what happens to a hitter’s schedule once October arrives. During the summer, he might face a struggling fifth starter followed by middle relievers working their third game in four nights. The postseason removes many of those favorable matchups.
Suddenly, an ace like Garrett Crochet can dominate an entire afternoon. If the starter falters, a manager can summon fresh bullpen arms throwing 98 mph with sharp breaking pitches. Hitters rarely get the same comfortable opportunities they enjoyed against weaker regular-season opponents. The numbers confirm that the competition changes.
According to MLB’s analysis of postseason pitching, four-seam fastballs have averaged 94.3 mph in October compared with 93.2 mph during regular seasons since pitch tracking began in 2008. The strikeout gap tells a similar story. Since 2001, postseason pitchers have generated a 21.7% strikeout rate compared with 19.7% during regular seasons. Their average Stuff+ rating has also reached 107.8 since 2020, against a regular-season benchmark of 100.
That’s a tougher assignment even for a healthy hitter. An extra mile per hour on a fastball cuts into reaction time. Better movement makes the barrel harder to find, while sharper secondary pitches punish hitters who start cheating to catch up with the heater.
A swing that produced a line drive in August might result in a weak grounder against a better-located October fastball. The hitter could execute the same movement and still make worse contact. Consequently, postseason exit velocities can decline without any corresponding loss of physical strength. Before blaming fatigue, analysts need to consider who’s throwing the pitches and how they’re attacking the hitter.
What Guerrero’s hitting coach saw when fatigue affected his swing
The distinction between fatigue and timing becomes especially interesting when looking back at Guerrero’s early career. During his 2019 rookie season, Guerrero showed flashes of enormous power but struggled to lift the baseball consistently. His average launch angle finished at just 6.7 degrees, among the lowest marks for qualified hitters. Toronto’s coaching staff believed fatigue played a role.
In February 2020, Blue Jays hitting coach Guillermo Martinez explained how Guerrero’s physical condition had affected his swing during the previous season.
“When he was fatigued, it caused him to search for more power, which caused him to jump at the baseball,” Martinez told MLB.com.
Martinez wasn’t simply describing a hitter who had lost strength. He identified a specific mechanical change. Guerrero began forcing his swing, moving too aggressively toward the pitch and leaving himself less time to adjust. The result was more pulled ground balls instead of the airborne contact his power could produce.
The coach also pointed toward Guerrero’s lower body. Fatigue could interfere with how he used his legs to generate force, encouraging him to compensate elsewhere in the swing. Those observations appeared in MLB.com’s report on Guerrero’s swing adjustments.
That history makes Guerrero’s 2025 postseason performance an intriguing comparison, though not evidence that he was dealing with the same problem. Six years after his rookie season, Guerrero could hammer a ground ball at 116 mph and follow it with a home run. The earlier contact represented tremendous power delivered at an unproductive angle. His later swing found the combination of force and elevation he needed.
The sequence also explains why coaches cannot diagnose fatigue by watching where one baseball lands. Martinez had identified a pattern in Guerrero’s mechanics over time. One hard grounder in October doesn’t establish that the same pattern has returned.
A fatigued hitter can develop timing problems, but a timing problem does not automatically mean the hitter is fatigued. That distinction should guide how teams interpret postseason exit velocities.
Exit velocity measures contact, not exhaustion
Statcast measures how fast a baseball travels immediately after contact. Its most familiar benchmark is 95 mph, the threshold MLB uses to classify a hard-hit ball. That information helps separate solid contact from weak contact. However, it doesn’t explain why a player produces one or the other.
Imagine a hitter who averages 90 mph throughout September. During October, his average drops to 87 mph. The decline looks concerning, especially if his batting average falls at the same time. Now look more closely.
Perhaps he has faced better breaking balls and started rolling over pitches on the outer half. He could also be fighting through a sore wrist that prevents him from generating his usual bat speed. Both situations can produce similar postseason exit velocities. They require different solutions.
Launch angle complicates the comparison further. Guerrero’s 116-mph grounder and 102.6-mph home run demonstrate why. One swing produced greater force, but the other delivered the ball at a much more productive angle. The hardest contact doesn’t always produce the best result.
Two-strike swings can distort the numbers
Hitters also change their mechanics depending on the count. Steven Kwan, for example, has built his offensive value around controlling the strike zone and putting the ball in play. His game doesn’t depend on matching the raw power of Aaron Judge or Giancarlo Stanton. Players with that contact-oriented approach often prioritize getting the barrel to difficult pitches rather than swinging with maximum force.
Statcast data shows that the broader league makes similar adjustments. In May 2024, MLB reported that hitters swung 1.6 mph slower with two strikes than they did earlier in the count. Their fast-swing rate dropped from 26% to 17%.
Those findings came from MLB’s first season of publicly available bat-tracking measurements. They showed that a slower swing can reflect deliberate decision-making rather than diminished strength.
October brings plenty of two-strike counts against elite pitching. Hitters shorten their swings, fight off sliders and try to stay alive long enough to get something manageable. When a player produces weaker contact while protecting the plate, he isn’t necessarily gassed. He might simply be trying to survive the at-bat.
But some hitters manage to keep punishing those difficult pitches even after a long season. Ben Rice provided a recent example.
Ben Rice shows why October power can survive a long season
The Yankees’ Ben Rice offered a timely counterargument to the fatigue narrative during the 2026 American League Wild Card Series against Boston. Rice collected five hits across the two-game series. Every one registered an exit velocity of at least 95 mph, and all five came against fastballs.
His performance wasn’t a sudden October surprise. During the regular season, Rice led qualified hitters with an .843 slugging percentage against four-seam fastballs. He also posted an .853 slugging percentage against elevated fastballs, the best mark in baseball among hitters meeting MLB’s qualifying threshold. Those numbers come from MLB’s 2026 Wild Card Series Statcast review.
Boston knew Rice could hit the heater. That didn’t stop him from doing damage. In Game 1, Red Sox left-hander Payton Tolle attacked him with four straight fastballs during his opening plate appearance. Rice drove the fourth into the right-center-field gap for a double.
Tolle changed his approach the next time they met, avoiding the four-seamer entirely. A curveball eventually finished Rice with a strikeout. That adjustment says as much about October hitting as Rice’s five hard-hit balls.
When a hitter thrives against one pitch, opponents can search for another way to beat him. A subsequent decline in exit velocity might reflect that change rather than fatigue. Rice’s success also carried into the Division Series. He homered twice against Tampa Bay in Game 2, although New York lost 5-2 and eventually exited in a three-game sweep.
His postseason exit velocities showed that he could still punish mistakes after the regular season. They didn’t prove he felt physically fresh every day, but they offered little support for a simple story about disappearing power. Not every October slump comes from tired legs.
Mike Napoli’s 2016 collapse remains a useful warning
Rice carried his power into October. Nearly a decade earlier, Mike Napoli provided a much different example of what happens when hard contact begins disappearing late in the season.
Napoli played 150 regular-season games for Cleveland in 2016, setting career highs with 34 home runs and 101 RBIs. At 34, he supplied the middle-of-the-order production Cleveland needed during its pennant run. But his bat cooled dramatically as the season wore on.
Before August 15, Napoli hit .266 with a .530 slugging percentage. From that date through the end of Cleveland’s postseason, he hit just .163 with a .281 slugging percentage. His contact quality also deteriorated.
An MLB Statcast examination of Napoli’s season found that his average exit velocity dropped from 89.1 mph before August 15 to 86.9 mph afterward during the regular season. That was a meaningful decline for a hitter whose power had carried much of Cleveland’s offense.
At first glance, fatigue seemed like an obvious suspect. Napoli had endured one of the heaviest workloads of his career, and his offensive production had fallen sharply. However, pitchers had also changed how they attacked him.
In July, Napoli saw offspeed pitches 10.7% of the time. That figure climbed to 13.2% in August and 18.4% in September. Pitchers increasingly fed him changeups low and away. The steady diet of offspeed pitches kept him off-balance against the fastball, particularly on pitches he had punished earlier in the year.
The change showed up in his results. Before August 15, Napoli went 16-for-46 against fastballs in four selected areas covering the inner third and elevated middle of the strike zone. During the remaining regular season, he went 0-for-21 against fastballs in those same locations.
Napoli might have been exhausted. Pitchers might also have figured out a better way to handle him. His declining contact quality belonged to a larger problem that involved both his workload and the opposition’s approach. The public data couldn’t cleanly separate those explanations.
For years, analysts could see declines like Napoli’s without knowing exactly what happened to the swing before contact. They had the exit velocity, but not the full movement behind it. That gap helps explain why hitting coaches still rely heavily on their eyes.
How hitting coaches spot the difference
Longtime major league hitting coach Dave Magadan offered a practical explanation during a 2018 interview with Sporting News.
When a hitter starts struggling, Magadan doesn’t begin by treating the batting average as a diagnosis. He compares the player’s current swing with footage from periods when he was hitting well. Magadan said coaches need to recognize mechanical changes and use video to confirm what they have noticed.
In his words, “hopefully, you can recognize the problem as soon as you see it with your own eyes.”
The full Sporting News interview explains how Magadan studies changes in posture, timing and contact rather than treating every slump as the same problem.
That approach matters because physical fatigue and mechanical timing issues can look remarkably similar from the stands. A tired hitter might struggle to use his lower body and begin rushing toward pitches, as Martinez observed with Guerrero. Another player might maintain his usual strength but start his swing too late against better velocity. The resulting weak grounders could look almost identical.
On video, the differences might appear in how early the hitter loads, when his front foot lands or whether his hands remain in their usual position. A coach can compare those movements with the player’s established swing. He can then ask whether the change persists against different pitch types and after additional rest.
Magadan’s explanation also introduces another complication. A hitter who repeatedly makes hard outs might begin pressing for results. That frustration can eventually create a mechanical problem even when his original swing was working. The coach’s job involves identifying what changed first.
Modern tracking technology has made that work easier, but it hasn’t replaced the need for observation.
Bat tracking gives the eye test more evidence
Public Statcast bat-tracking data, introduced in 2024, added another piece to the puzzle. Instead of relying entirely on how hard a ball leaves the bat, teams and analysts can examine bat speed, swing length and contact efficiency. Those measurements help distinguish a hitter who cannot generate his usual force from one who simply isn’t making clean contact.
Suppose a batter’s average exit velocity falls three miles per hour during October. His bat speed, however, remains nearly identical to his September average. That combination would encourage a hitting coach to look at timing and contact location before assuming physical fatigue.
A different pattern deserves more attention. If bat speed drops alongside exit velocity, hard-hit rate and barrel rate, the hitter might genuinely be struggling to produce his usual power. Even then, changes in count and swing intent need consideration. The key is to compare similar swings rather than treating every at-bat equally.
EV50 can reveal whether the best contact has disappeared
One particularly useful Statcast measurement is EV50. According to Baseball Savant’s Statcast definitions, EV50 averages a hitter’s hardest 50% of batted balls. It offers a different view of contact quality than overall average exit velocity.
Consider a hitter who continues producing 105-mph line drives but also makes more weak contact. His average exit velocity could decline even while his strongest swings remain intact. EV50 would help reveal that distinction.
Now imagine that the same hitter’s maximum exit velocity and EV50 both fall over several weeks. His bat speed also drops, despite facing a comparable mix of pitches. That would provide a stronger reason to investigate his physical condition.
The comparison works much like Magadan’s video review. Instead of relying on a hitter’s latest batting average, coaches examine whether his normal performance has changed. Statcast adds measurable evidence to the visual assessment.
It still wouldn’t prove fatigue. Mechanics, injuries and opposing pitch selection could contribute to the decline. But the evidence would carry more weight than a few weak October grounders.
Postseason exit velocities become most useful when analysts study their distribution rather than obsessing over one average. The strongest swings deserve attention, along with how frequently a hitter can repeat them.
Why the postseason sample can fool analysts
October creates another statistical problem: the sample is tiny. A regular-season starter might accumulate hundreds of batted balls across six months. A hitter eliminated after two playoff games could finish with only a handful.
One mishit slider can drag down that small average. A single well-struck double might push it sharply in the opposite direction. Those swings can feel decisive because the games matter so much. Statistically, they remain a limited sample.
Analysts studying postseason exit velocities should compare October contact with the player’s full regular-season performance. They should also examine September separately, looking for signs that a decline started before the playoffs. Pitch type matters just as much.
A hitter who faced mostly average fastballs in September but encounters a steady run of high-velocity heaters in October hasn’t received equivalent opportunities. Count, handedness and pitch location can change the difficulty of those opportunities further.
A more useful comparison might examine how hard he hits 96-mph fastballs in similar parts of the strike zone. If his contact quality declines under those conditions, the result becomes more meaningful. Teams can also study how his bat speed changes after scheduled rest days.
If a player returns from an off-day and repeatedly produces stronger swings, fatigue becomes a more credible possibility. However, better pitch selection or a favorable matchup could explain the improvement. Clubs have another advantage that public Statcast databases cannot provide. Their training staffs can assess soreness, physical workload and recovery patterns directly.
That information matters when interpreting the numbers. A manager shouldn’t bench a hitter simply because his average exit velocity slipped during three difficult games. Nor should he ignore a month-long decline because the player occasionally crushes a baseball.
For managers, the trick is figuring out when a cold streak is just a slump and when a player’s body is telling him to sit down.
What the rest of October can reveal about hitter fatigue
October will continue producing impressive exit-velocity readings and miserable offensive performances. Those outcomes aren’t contradictory.
Guerrero’s 116-mph groundout offers the perfect reminder. He hit the ball harder than almost anyone else that postseason, but Seattle’s defense erased the swing before Toronto could benefit. Rice provides another perspective. He carried his regular-season ability to punish fastballs into the 2026 playoffs, even as opponents searched for ways to avoid his favorite pitches.
Napoli’s 2016 season raises the more difficult question. His contact quality and offensive production both deteriorated, but fatigue and changing pitching strategies offered competing explanations. Together, those examples show why postseason exit velocities deserve careful interpretation rather than quick judgments.
A tired hitter can still crush one baseball. His problem might be repeating that swing consistently, particularly when pitchers attack him with premium velocity and sharper breaking pitches. That difference could shape a postseason lineup.
A player whose bat speed has genuinely declined might benefit from additional recovery time. Another hitter with normal bat speed but poor contact could need a mechanical adjustment or a different plan against breaking balls. Those aren’t interchangeable problems.
Managers also face a difficult balance. Resting a productive veteran might help him recover, but removing him from the lineup could leave the offense without one of its best hitters. Meanwhile, the postseason schedule already includes additional days off. Some players may recover physically while struggling to maintain the timing they developed through daily at-bats.
That makes fatigue harder to isolate. As the remaining October games unfold, analysts should look beyond whether a hitter’s average exit velocity rises or falls. Bat speed, EV50, hard-hit rate and pitch-specific contact quality can reveal whether his strongest swings still resemble those from earlier in the season.
Consistency matters more than one memorable blast. Guerrero’s former hitting coach recognized fatigue through the changes it produced in his swing. Magadan approached slumps by comparing what he saw with the movements that had made a hitter successful.
Today’s tracking technology gives coaches more ways to test those observations. It doesn’t eliminate the need to understand the player behind the numbers.
After 162 games, the body certainly has reasons to be tired. But when the next hitter rolls over a 98-mph fastball, the explanation might have nothing to do with exhaustion. Perhaps the pitcher simply won.
And that’s the question postseason exit velocities still cannot answer on their own: Did the hitter lose his power, or did October make it harder to use?
READ ALSO: How early runs turn Division Series bullpen plans upside down in October
FAQs
Does lower exit velocity mean an MLB hitter is tired?
Not necessarily. Better pitching, poor timing and changes in a hitter’s approach can all reduce exit velocity without proving physical fatigue.
Why do hitters struggle more in the MLB postseason?
Postseason pitchers generally throw harder and feature better breaking balls. Hitters have less room for mistakes, even when their swings remain strong.
What is a good exit velocity in baseball?
MLB considers a ball hard-hit when it leaves the bat at 95 mph or faster. Launch angle also affects the result.
Can Statcast detect hitter fatigue?
Statcast can reveal drops in bat speed and contact quality. Coaches still need other evidence to determine whether fatigue caused those changes.
What is EV50 in baseball?
EV50 measures the average exit velocity of a hitter’s hardest 50% of batted balls. It helps show whether his strongest contact remains intact.
