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Jun 23, 2026

ABS All-Stars: MLB's Best Challengers at Each Position

ABS All-Stars: MLB's Best Challengers at Each Position

With the All-Star Game fast approaching, we’re highlighting the best players at challenging balls and strikes with baseball’s new system. Tim Capurso|
Nationals shortstop CJ Abrams has yet to lose an ABS challenge this season.
Nationals shortstop CJ Abrams has yet to lose an ABS challenge this season. | Nathan Ray Seebeck-Imagn Images

It's All-Star season in baseball, as the fan vote for the American and National League All-Star teams is underway. And given that the 2026 MLB season is the first year the ABS challenge system is being utilized at the big-league level, we thought it was only fitting that the best of the best at challenging balls and strikes got some recognition.

Note: Minimum five challenges for hitters, minimum 10 challenges for catchers, no minimum for pitchers

C: Carson Kelly, Cubs

Chicago Cubs catcher Carson Kelly (15) receives a new ball from the umpire
Carson Kelly has built considerable trust with the Cubs pitching staff when it comes to challenging balls and strikes. | Charles LeClaire-Imagn Images

Few catchers have been as impactful as Kelly with the ABS challenge system. Kelly’s 78% success rate (on 37 challenges) ranks fourth among catchers who have made at least 10 challenges, and he has gained the third-most strikeouts and eliminated the fourth-most walks for the Cubs pitching staff. Most impressive of all? The majority of Kelly’s challenges have come in the later innings of games, and he has created 1.5 net runs as a result of his challenges, the best mark in baseball.

1B: Sal Stewart, Reds

Sal Stewart, Cincinnati Reds, ABS challenge
Reds first baseman Sal Stewart has won more challenges than any hitter in baseball. | Aaron Doster-Imagn Images

Not only is Stewart in the running for the National League Rookie of the Year award thanks to his stellar production at the dish, but he’s also been baseball’s best hitter at utilizing the ABS challenge system. No hitter has been more aggressive with the new implementation than Stewart, who has challenged more pitches (30)—and had more successful challenges (20)—than any hitter in the game. Stewart’s excellent eye for the strike zone and experience with the ABS system in the minor leagues has served him well on many challenges, like this one to flip a strikeout.

2B: Jose Altuve, Astros

Jose Altuve, Houston Astros, ABS challenge system
The Astros have been one of the best teams at utilizing the ABS challenge system and Jose Altuve is one of the biggest reasons why. | Denny Medley-Imagn Images

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