Umpiring MLB Regulations MLB Rules Postseason Rules Interference Pitch Clock Game Mechanics Equipment Regulations Regulations Designated Hitter Strike Zone Challenge System Pitching Sign Stealing Foreign Substances Automated Systems Challenges Game Changes ABS Challenge System Scoring Umpiring Decisions Gameplay Rules Game Conduct Infield Fly Rule Banana Ball Rules Technology Tiebreakers Balks Bat Regulations Umpires Fan Interference Gameplay Player Safety Home Run Derby Rules Golden At-Bat Game Rules Game Regulations Player Conduct MLB Policies Major League Baseball Home Plate MLB Rule Changes Rule Changes Obstruction Replay Review Bench-Clearing Brawls Statcast Tiebreaker Rules Batting Order Pitch Counts Stealing Bases Fly Out Force Out Sacrifice Fly Bullpens Suspensions Runners in Scoring Position Bases Loaded RBI Groundouts Home Runs Strikeouts Hits At-Bats Outs Relief Pitchers Closers Saves Spring Breakout Rules Substance Use Sticky Substances Umpire Instructions Innovations Gambling Late Slide Ghost Runner Rule Gambling Helplines Rule Violations Catcher's Positioning Baserunning Rules Fan Interference Rules Fair and Foul Balls Instant Replay Automatic Balls and Strikes Non-Reviewable Plays Umpire Decisions Swing-Off Eligibility Gameplay Regulations Collective Bargaining Agreement Umpire Authority Fighting Arbitration Pace-of-Play Obscure Rules Tiebreaker Rule 5.06 Challenge Rules Home Run Counting Balk
Clubs are using spring reps to assign responsibility for challenges, often pointing to the catcher.
