In a matter of months, a tap on the head has become as commonplace in Major League Baseball as “Take Me Out to the Ball Game,” mascots and monstrous home runs. The Automated Ball-Strike challenge system has afforded MLB’s 30 clubs with a rare opportunity to turn a game on its head by challenging an umpire’s call with a literal tap on the head.At the midpoint of MLB’s season, all 30 clubs had initiated at least 150 challenges. However, not all challenges are created equal, and some clubs — and by extension, some players — have been better at it than others. As anticipated, catchers lead the way in total challenges, but some hitters have been particularly aggressive with the system.Using data gleaned from TaptoChallenge.com, along with conversations with MLB players, here’s how teams, players and umpires have fared at the midpoint of the 2026 campaign.All data through the end of play on July 12 unless otherwise noted.Some teams are still reluctant to challengeThrough the All-Star break, no team was more successful at ABS challenges than the Cincinnati Reds. Remember back in February 2025, when Cincinnati manager Terry Francona brushed off its use in spring training? At the time, the system was still off on the horizon for MLB, and Francona was more focused on the present.“It’s not a strategy for (the MLB teams), so why work on it?” Francona said at the time. “I don’t want to make a farce of anything, but we’re here getting ready for a season and that’s not helping us get ready.”