"It was nice to get the win and the points, and win the division," Grubauer said. "I think that was huge. Last couple games we played in here weren't too good, so it's a momentum-builder for us. We have to make sure we play the right way next couple games. It's going to be huge."
Matt Murray made 31 saves for Pittsburgh (45-29-6), which is two points ahead of the Columbus Blue Jackets and Philadelphia Flyers for second in the Metropolitan. The Blue Jackets and Flyers each have played one fewer game than the Penguins.
Pittsburgh clinched its 12th straight berth in the Stanley Cup Playoffs with a 5-2 win against the Montreal Canadiens on Saturday.
"I don't think we're going to learn anything new [about the Capitals]," Penguins coach Mike Sullivan said. "We've played these guys so many times. We know exactly what they are, and they know what we are. … There's a lot of familiarity on both sides. Everybody knows what kind of game it's going to be going in."
Alex Ovechkin played his 1,000th NHL game, all with the Capitals, the first player in their history to do so.
"It's important. Milestones are milestones," said Ovechkin, who had four shots on goal in 22:47. "It's history. It's nice to be in the history book."
T.J. Oshie gave Washington a 1-0 lead at 6:25 of the first period. Andre Burakovsky stick-handled through the neutral zone before passing to Oshie, who held off Evgeni Malkin before skating in alone on Murray and beating him five-hole.