Mason says he won't dress for the game and his status for the series remains iffy because of an upper-body injury. Mason shared practice time with Emery on Monday.
Emery was excellent in Sunday's 4-2 comeback win at Madison Square Garden that tied the best-of-seven, first-round series at 1-1.
Emery made 31 saves in Game 2 to win his first post-season game anywhere in exactly three years for Anaheim at Nashville. Mason hasn't played since he was injured in a collision in the next-to-last game of the regular season on April 12.
I downplayed the first one because I thought it's just a hockey game. We just want to win the game; it's against our rival and we want the two points. I downplayed it, but now having gone through the first one I look back and say, 'Geez, that was really cool.' I think as I've grown a bit older I've got a lot more appreciation for what we're allowed to do every day.
— Capitals forward Brooks Laich on the 2015 Bridgestone NHL Winter Classic, the second one of his career after 2011 in Pittsburgh