Walker's picking basketball over birthday cake

How does a rookie celebrate his 21st birthday with the world champion Boston Celtics?

Bill Walker’s answer may surprise you.

“Oh man, I’ve got to guard against LeBron James and (Sasha) Pavlovic and all those guys tomorrow,” Walker said. “So I’m resting.”

Walker will lay low in preparation for Friday’s preseason match up against the Cleveland Cavaliers in Providence, Rhode Island.

Darius Miles also celebrated a birthday today, turning 28. Walker and a handful of teammates serenaded him before Thursday’s practice.