MLB plans to emphasize enforcement of balks as changes kick in

Major League Baseball plans to emphasize enforcement of the balk rule in 2023 as it implements sweeping rules changes, including a pitch clock that will place more focus on the arcane rule, league officials said Tuesday.

“We have slipped a little bit centrally with calling the rulebook illegal pitches and balks,” said Morgan Sword, MLB’s executive vice president of operations, at a media briefing to explain the rules in greater depth.

The balk, which is intended to keep pitchers from deceiving runners on base, can be called by umpires for more than a dozen reasons. Balks are assessed only with runners on. Prohibited deliveries with the bases empty are deemed illegal pitches. The import of both is especially acute with the new pitch-timer rule, which mandates a pitcher throw within 15 seconds of receiving the ball with the bases empty and 20 seconds with runners on. If a pitcher balks, runners advance one base.

Stressing the delivery of legal pitches matters because it coincides with the beginning of a delivery, which is when the pitch clock is supposed to stop. Pitchers who violate the rule are assessed a ball as a penalty. Similarly, if hitters are not in the batter’s box and facing the pitcher with 8 seconds left on the clock, they will be given an automatic strike.

Trying to understand what constitutes a balk is tantamount to what makes a catch in the NFL. Umpires called 122 balks in 2022, the fewest in a full season since 1973, with some umpires more vigilant than others. Umpire John Tumpane assessed a major league-record three balks in one at-bat to then-Miami left-hander Richard Bleier during a late-September game. Bleier’s three balks tied for the major league lead with left-handed reliever Will Smith last year.

A number of pitchers, including Houston’s Luis Garcia, Toronto’s Kevin Gausman, Boston’s Kenley Jansen and the Chicago White Sox’s Mike Clevinger, are expected to change their deliveries on account of the new rules.