MLB September 7, 2023 6:53 pm MLB postseason format: How many teams, wild cards make the playoffs? The 2023 MLB postseason starts Tuesday, Oct. 3. Here is how MLB’s playoff format works. US & World Videos 2:09 Celtics ready for Eastern Conference Finals against Pacers 2:51 Michael Johnson on ‘dynamic personalities' of Noah Lyles, Sha'Carri Richardson 0:47 Timberwolves, Mavericks to meet in 2024 Western Conference Finals 0:54 Xander Schauffele wins PGA Championship, first major title 1:02 Celtics, Pacers to meet in 2024 Eastern Conference Finals