Seven weeks into Major League Baseball’s first season with the Automated Ball-Strike (ABS) Challenge System, one team has already emerged as the clear frontrunner—and another is struggling to keep pace. The Detroit Tigers are dominating the challenge game, while the Washington Nationals are falling far behind.

The moment that best captures this new era came on April 5, when Tigers catcher Dillon Dingler caught the ball, paused, tapped his helmet, and looked up at the Comerica Park scoreboard. It was barely a week into the season, and Dingler was still getting a feel for the new system. “You’re just hoping to God you got it right, to be honest,” he said after going a perfect 4-for-4 on challenges that day.

Fast forward to today, and Dingler is getting it right more than anyone. He leads all catchers with a 91% success rate on challenges (19 for 21), and his backup, Jake Rogers, is 4 for 5. Together, they’ve helped the Tigers post a league-best 60.5% overall challenge success rate—a stat that has quickly become a talking point around the league.

But not everyone is thriving. Chicago White Sox catcher Edgar Quero is struggling the most, with just a 42.9% overturn rate on 42 challenges—the worst among catchers with significant volume. On the flip side, Houston Astros infielder Isaac Paredes is perfect so far, going 4-for-4. Other standout performers include Marcus Semien (Mets), Teoscar Hernández (Dodgers), Mike Trout (Angels), and Nick Kurtz (Athletics), all sitting at 83.3%. Even Aaron Judge is off to a strong start, converting 4 of 5 challenges (80%).

Among catchers with heavy usage, Will Smith of the Los Angeles Dodgers leads the pack with 36 attempts and a solid 75% success rate. The system has added a new layer of strategy to the game, and early returns show that some players—and teams—are adapting faster than others.

As the season progresses, these numbers will only become more telling. For now, the Tigers are setting the standard, and the rest of baseball is taking notes.