The Boston Celtics will need to stave off elimination without one of their key frontcourt figures in Game 6 against the Milwaukee Bucks.

Big man Robert Williams is set to miss his third game in a row due to knee soreness. Via ClutchPoints:

This is a big blow for the Celtics. Williams is an elite shot-blocker and an imposing figure inside. He's only played five games in the playoffs thus far however after undergoing a procedure on his knee. That same injury is clearly bothering him again. Williams has averaged 6.2 points, 4.8 rebounds, and 1.8 blocks per contest.

That being said, Daniel Theis and Al Horford should continue to see increased minutes at center. Horford has been a revelation lately for the Celtics, going off for 30 points in a Game 5 win and also dropping 22 in Game 4. He posted only eight points on Wednesday, though. Stopping Giannis Antetokounmpo is always an extremely tough task and with no Williams, it will be up to a number of different players to try and contain him.

The Celtics led for most of Game 6 but the Bucks made a late run and Jrue Holiday came up with a couple of huge defensive stops to help Milwaukee take a 3-2 series lead. Boston will be hoping to force a Game 7.