During the Boston Celtics‘ second-half resurgence, a number of players have emerged to play key roles in the turnaround. Chief among them are the team’s frontcourt All-Stars, Jayson Tatum and Jaylen Brown. While both players are in the midst of career years, they have been particularly good as of late.

In Boston’s April 15 win over the LA Lakers, Brown dropped an incredible 40 points on just 20 shot attempts. And Tatum was named Eastern Conference Player of the Week recently after a string of games that included a 53-point outburst against the Minnesota Timberwolves.

As good as the Celtics’ dynamic duo has been, though, the improved play of the team’s support players has undoubtedly played an equal role in Boston’s transformation.

In particular, a certain Celtics role player has managed to have a massive impact on games with his defense.

He may not have captured headlines with his play as of late, but when second-year forward Grant Williams has been on the court for head coach Brad Stevens lately, the opposition has largely struggled to put up enough points to keep pace with Beantown’s big guns.