🏛️Official — MLBIn Season
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Recorded May 13, 2026
COVID-shortened 60-game season. Designated hitter used in both leagues (interim universal DH). Ghost runner placed on second base at the start of each extra-inning half-inning. Postseason expanded to sixteen teams (eight per league); first round best-of-three with the higher seed hosting all games. Doubleheaders consisted of two seven-inning games.
Recorded May 7, 2026
Seven-inning doubleheaders retained from 2020. Foreign-substance enforcement intensified mid-season — players caught with grip/spin-enhancing substances ejected immediately and suspended 10 games. Ghost-runner extra-innings rule continued. Three-batter minimum and 13-pitcher roster limit waived for 2021.
Recorded May 7, 2026
National League adopted the designated hitter full-time (universal DH). Postseason expanded to twelve teams — three division winners (seeded 1–3) and three wild cards (seeded 4–6) per league. Ghost-runner rule reinstated for regular-season extra innings after a brief repeal. End-of-season tie-breaker games eliminated in favor of statistical tiebreakers.
Recorded May 7, 2026
Pitch clock introduced — 15 seconds with bases empty, 20 seconds with at least one runner on. Defensive shift restriction — at least four players in infield positions, with two on each side of second base. Bases enlarged from 15 to 18 inches. Pickoff disengagement limit set at two per plate appearance (resets if a runner advances). Ghost-runner-on-second extra-inning rule made permanent for regular season.
Recorded May 7, 2026
Pitch clock restart timing changed — clock now restarts when the pitcher receives a new ball from the umpire (previously when the pitcher entered the mound circle). Runner's lane widened to the cut of infield grass in fair territory. Mound visits reduced from five to four per game.
Recorded May 7, 2026
8.1 Protective Equipment Requirements
May 23, 2026Section 8: Safety Considerations
May 23, 20265.3 Pitching (OBR Rule 5.07)
May 23, 20268.6 Suspended Games and Weather Delays
May 23, 20265.1 Starting the Game (OBR Rule 5.01)
May 23, 20263.4 The Batter's Box, Catcher's Box, and Coaches' Boxes (OBR Rule 2.05–2.07)
May 23, 20262.4 Helmets and Protective Equipment (OBR Rule 3.09)
May 23, 20262.2 The Bat (OBR Rule 3.02)
May 23, 20262.1 The Baseball (OBR Rule 3.01)
May 23, 20268.5 Mound Visits and Pitcher Health
May 23, 20268.4 Hit Batters and Batter Safety (OBR Rule 5.05(b)(2))
May 23, 20267.8 Pine Tar Incident and Bat Violations (OBR Rule 3.02(c))
May 23, 20267.7 Appeal Plays (OBR Rule 5.09(c))
May 23, 20267.6 The Infield Fly Rule Violation
May 23, 20267.4 Obstruction (OBR Rule 6.01(h))
May 23, 20267.3 Interference (OBR Rule 6.01)
May 23, 20267.2 Illegal Pitch (OBR Rule 6.02(b))
May 23, 20266.6 Regulation Games (OBR Rule 7.01–7.04)
May 23, 20265.4 Batting (OBR Rule 5.04)
May 23, 2026Section 5: Rules of Play
May 23, 20264.5 The Manager and Coaches (OBR Rule 4.05–4.06)
May 23, 20264.3 The Designated Hitter (OBR Rule 5.11)
May 23, 20264.2 Substitutions (OBR Rule 5.10)
May 23, 20263.6 The Dugout
May 23, 20263.3 The Pitcher's Mound (OBR Rule 2.04)
May 23, 20263.1 The Playing Field (OBR Rule 2.01)
May 23, 2026Section 3: Playing Area
May 23, 20262.5 Uniforms (OBR Rule 3.03)
May 23, 2026Section 2: Equipment
May 23, 20268.3 Sliding Rules and Takeout Slides (OBR Rule 6.01(j))
May 23, 20268.2 Collision Rules at Home Plate (OBR Rule 6.01(i))
May 23, 20267.9 Ejections and Suspensions (OBR Rule 8.04)
May 23, 20267.5 Foreign Substances and Doctored Balls (OBR Rule 6.02(c))
May 23, 20267.1 Balk (OBR Rule 6.02(a))
May 23, 2026Section 7: Violations & Penalties
May 23, 20266.5 Official Scorer (OBR Rule 9.01–9.02)
May 23, 20266.4 Extra Innings and Tiebreakers
May 23, 20266.3 Earned and Unearned Runs (OBR Rule 9.16)
May 23, 20266.1 How Runs Are Scored (OBR Rule 5.08)
May 23, 2026Section 6: Scoring
May 23, 20265.8 Recording Outs (OBR Rule 5.09)
May 23, 20265.7 Shift Restrictions (OBR Rule 5.02(c)) — Effective 2023
May 23, 20265.6 The Infield Fly Rule (OBR Rule 5.09(a)(12))
May 23, 20265.2 The Pitch Clock (OBR Rule 5.07(c)) — Effective 2023
May 23, 20264.4 The Umpires (OBR Rule 8.01–8.04)
May 23, 20264.1 Teams and Rosters (OBR Rule 4.01–4.03)
May 23, 2026Section 4: Players & Officials
May 23, 20262.3 Gloves and Mitts (OBR Rule 3.05–3.07)
May 23, 20265.5 Baserunning (OBR Rule 5.05–5.09)
May 23, 20263.2 The Bases (OBR Rule 2.02)
May 23, 2026