Major League Baseball’s new Automated Balls and Strikes (ABS) system, introduced in the 2026 season, has significantly impacted gameplay by allowing batters, pitchers, and catchers to challenge umpire ball and strike calls. Teams start each game with three challenges, which are only deducted if the challenge is incorrect, potentially enabling unlimited successful challenges. Notably, a May 14 game between the St. Louis Cardinals and Oakland Athletics set a record with 12 combined ABS challenges, nine of which were upheld. Over the regular season, out of more than 10,500 challenges, 54% resulted in overturned calls with fielders (pitchers and catchers) having a higher success rate (58%) than batters (49%).

The challenge activity increases during the postseason, with players successfully contesting calls at a higher frequency. During the Wild Card round, teams averaged approximately 4.5 challenges per game, but this jumped to nearly seven per game in the Division Series. The accuracy for players’ challenges in these playoffs has surged, with players winning about 67% of their ABS challenges, outperforming umpires by a wide margin and reflecting greater confidence and possibly better reading of the strike zone during high-stakes games.

Several playoff games illustrated this trend with teams often winning the majority of their challenges. For instance, in Game 1 of the Division Series at Tropicana Field and in Cleveland, teams combined to win five of six and four of five challenges, respectively. The intensity and strategic use of challenges were further highlighted in pressure moments, such as the Brewers vs. Padres Game 2, where timely challenges influenced the count and ultimately the game’s outcome, demonstrating how critical ABS challenges have become in postseason baseball.

Players and teams are embracing the challenge system aggressively, as noted by Braves catcher Drake Baldwin, who affirmed the intention to maintain challenge usage deep into games. The new technology has not only changed the way umpires and players interact but also enhanced fan engagement by adding suspense and drama to pitch calls. With much more postseason action ahead, the influence of ABS challenges on the game’s outcomes is poised to continue growing, captivating audiences and reshaping baseball strategy.