The biggest year-to-year change in the Major League Baseball rulebook will occur in 2023. , MLB will implement a pitch clock, ban defensive Joc Pederson Jersey shifts and increase the size of the bases ahead of next season.The vote upon defensive shifts and the pitch Joe Kelly Jersey clock was not unanimous. Conducted by MLB's competition committee, the board is made up of MLB appointees and players, though the players make up a minority and were unable to vote down the ban on defensive shifts and Max Muncy Jersey the pitch clock.However, the vote for larger bases was unanimous.The pitch clock will function as such: a 15-second timer will be set with bases empty Sandy Koufax Jersey and a ball will be called if the pitch is delivered after the time expires, but a 20-second clock will be enforced with runners on base.Scroll to Fernando Valenzuela Jersey continueOn defense, two fielders must be on either side of the second base bag, with both feet on the infield dirt.More From SI's Inside The Astros: