Postseason Rules Umpiring MLB Rules MLB Regulations Regulations Pitch Clock Equipment Regulations Game Mechanics Foreign Substances Interference Rule Changes Obstruction MLB Policies Golden At-Bat Pitching Scoring Strike Zone Home Plate Game Changes Bat Regulations Stolen Base Rules Game Dynamics Replay System Player Safety Plate Blocking Batter's Box Timeout Catcher Positioning Blocking the Plate Blocking-the-Plate Rule Rule 5 Draft Golden At-Bat Rule Gameplay MLB Changes Designated Hitter Pitch Clock Rule Timing Violations Automated Strike Zone Tacky Ball" Concept Pitcher Grip Substances MLB Commissioner Statements Challenge System Challenges Automated Systems Legal Equipment Substances Scoring positions Runners on base Shutout Illegal Foreign Substances Ejections Bench-Clearing Brawls Statcast Balks Batting Order Pitch Counts Stealing Bases Fly Out Force Out Sacrifice Fly Bullpens Suspensions Fan Interference 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 Major League Baseball Late Slide Ghost Runner Rule Gambling Helplines Rule Violations Umpiring Decisions Catcher's Positioning Fan Interference Rules Fair and Foul Balls Umpires Instant Replay Non-Reviewable Plays MLB Rule Changes Pace-of-Play Injuries Infield Fly Rule Consequences MLB Rulings