Major League Baseball implemented the ABS challenge system for the 2026 season, which allows players to challenge a ball or strike call made by the plate umpire. Each team receives two challenges to start the game, and only batters, pitchers and catchers can challenge a call. If a team wins a challenge, it can keep challenging. If a team challenges incorrectly twice, it loses its challenges for the rest of the game.
Here are the ABS challenge system rankings for batters, pitchers, catchers, teams and umpires for the 2026 MLB season.
Data updated through Thursday, April 9.
Batter ABS Challenge Leaders Pitcher ABS Challenge Leaders Catcher ABS Challenge Leaders MLB Team ABS Challenge Rankings Umpire ABS Challenge Leaders Rank Name Pitches Calls Overturn Pitches 1 John Libka 1 0 0.0% 237 2 Will Little 10 1 10.0% 919 3 Erich Bacchus 9 1 11.1% 920 4 John Tumpane 7 1 14.3% 603 5 Derek Thomas 5 1 20.0% 363 5 Emil Jimenez 5 1 20.0% 299 7 Jordan Baker 8 2 25.0% 834 7 Chris Conroy 4 1 25.0% 662 7 Roberto Ortiz 4 1 25.0% 281 10 Quinn Wolcott 7 2 28.6% 916 10 Ryan Additon 7 2 28.6% 649 12 Nestor Ceja 9 3 33.3% 872 12 Shane Livensparger 6 2 33.3% 609 12 Stu Scheurwater 6 2 33.3% 581 12 Mike Muchlinski 3 1 33.3% 517 12 James Jean 3 1 33.3% 299 12 Edwin Jimenez 3 1 33.3% 274 18 David Rackley 14 5 35.7% 1203 19 Vic Carapazza 11 4 36.4% 923 19 D.J. Reyburn 11 4 36.4% 648 19 Ramon De Jesus 11 4 36.4% 634 22 Adam Beck 8 3 37.5% 598 22 Edwin Moscoso 8 3 37.5% 666 24 Rob Drake 13 5 38.5% 903 25 Alan Porter 5 2 40.0% 541 26 Lance Barksdale 12 5 41.7% 888 27 Gabe Morales 7 3 42.9% 569 27 Jansen Visconti 7 3 42.9% 553 27 Jeremie Rehak 7 3 42.9% 570 30 Ben May 9 4 44.4% 664 30 Alex Tosi 9 4 44.4% 519 32 Nick Mahrley 11 5 45.5% 925 32 Malachi Moore 11 5 45.5% 870 34 Ryan Blakney 13 6 46.2% 856 35 Carlos Torres 12 6 50.0% 921 35 Nate Tomlinson 12 6 50.0% 856 35 Todd Tichenor 10 5 50.0% 886 35 Hunter Wendelstedt 8 4 50.0% 499 35 Mark Ripperger 8 4 50.0% 635 35 Chris Guccione 6 3 50.0% 615 35 Willie Traynor 6 3 50.0% 664 35 Alex MacKay 2 1 50.0% 263 43 Nic Lentz 23 12 52.2% 1083 44 Bruce Dreckman 15 8 53.3% 935 45 Tripp Gibson 13 7 53.8% 1005 45 Marvin Hudson 13 7 53.8% 1102 47 Tom Hanahan 9 5 55.6% 611 48 Brian O'Nora 14 8 57.1% 973 48 Dan Merzel 7 4 57.1% 563 48 Brennan Miller 7 4 57.1% 631 48 Steven Jaschinski 7 4 57.1% 324 52 Manny Gonzalez 12 7 58.3% 634 53 Scott Barry 5 3 60.0% 608 53 Laz Diaz 15 9 60.0% 854 53 Lance Barrett 15 9 60.0% 868 56 Doug Eddings 13 8 61.5% 894 56 Charlie Ramos 13 8 61.5% 872 58 Alfonso Márquez 8 5 62.5% 789 59 Bill Miller 11 7 63.6% 840 60 Dan Iassogna 17 11 64.7% 1172 61 Dan Bellino 15 10 66.7% 855 61 Adam Hamari 6 4 66.7% 564 61 Brian Walsh 3 2 66.7% 250 64 Mark Wegner 13 9 69.2% 917 65 Chad Fairchild 10 7 70.0% 574 66 Adrian Johnson 24 17 70.8% 1312 67 James Hoye 7 5 71.4% 605 67 Ryan Wills 7 5 71.4% 645 69 Cory Blaser 8 6 75.0% 615 69 Sean Barber 8 6 75.0% 604 71 CB Bucknor 9 7 77.8% 674 71 Paul Clemons 9 7 77.8% 538 73 Ron Kulpa 14 11 78.6% 683 74 Mike Estabrook 15 12 80.0% 873 74 Junior Valentine 5 4 80.0% 567 76 Chris Segal 17 14 82.4% 859 77 Andy Fletcher 17 15 88.2% 905 78 Chad Whitson 11 10 90.9% 576 79 Jim Wolf 3 3 100.0% 274 79 Brock Ballou 2 2 100.0% 247 79 Clint Vondrak 2 2 100.0% 573
