Celtics star Jayson Tatum was ruled out for Game 7 against Philadelphia on Saturday night with left knee stiffness. The team announced the news about 90 minutes before the start of the winner-take-all first-round matchup between Boston and the Philadelphia 76ers. With Tatum out, Mazzulla made radical changes to the starting lineup for Game 7, opting to start Baylor Scheierman, Luka Garza and Ron Harper Jr. alongside Jaylen Brown and Derrick White.