ESPN’s Jeff Passan reports that MLB’s decision to introduce a pitch clock for the 2023 season will have an as of yet unexpected side effect: stricter enforcement of rules surrounding balks and illegal pitches. In addition, Bob Nightengale of USAToday writes that arguing pitch clock violations will result in an automatic ejection for managers. This decision follows recent decisions to make the “ghost runner” extra innings rule permanent and enforce limits on position players pitching.

This crackdown on illegal pitches is due to the fact that the clock, which allows a pitcher 15 seconds before pitching with the bases empty and 20 seconds with runners on base, is meant to be stopped at the beginning of a pitcher’s delivery. Passan writes that the league has informed umpires to call a balk (or an illegal pitch resulting in an automatic ball if no one is on base) if a pitcher takes more than one step to the back or side in his windup before moving towards home plate. Certain pitchers have previously used more complicated deliveries involving multiple toe-taps or sidesteps that’ll no longer be permissible.

It’s an increased emphasis that’ll come into play for pitchers working both out of the windup and from the stretch, although a balk call is obviously only relevant if there’s a runner on base. A windup violation with no one on base will lead to an automatic ball. Passan notes the clock stops running for a pitcher who works from the stretch once they lift their front leg.

The league already seemed likely to see an uptick in balks this year thanks to a different rule change: the limitation on pitcher disengagements from the mound. A pitcher is limited to two unsuccessful disengagements (pickoff attempts or simply stepping off the rubber) in an at-bat. If a pitcher steps off a third time and does not record a successful pick-off, the baserunner advances on a balk.

The rules changes will be in effect in Spring Training games, though they’re not implemented for the upcoming World Baseball Classic. Any pitchers participating in the WBC will get less time than their peers to adjust and get used to these rule changes than they otherwise would, as the tournament runs during the final month of Spring Training. Pitch clocks have been in effect for years in the minor leagues, however, so a number of MLB pitchers have some experience with those restrictions.