Maatta's fourth goal of the season gave Pittsburgh its only lead as the Penguins won their 13th straight home game, a club record.
Alexander Ovechkin's 34th goal of the season gave Washington a 3-2 lead midway through the third period but the Capitals collapsed over the final 10 minutes. Brooks Laich and Jason Chimera also scored for Washington, which lost for the seventh time in nine games. Neuvirth made 33 stops, but didn't see Maatta's blast from the point with 1:54 left.
MAPLE LEAFS 4, SABRES 3, SO
TORONTO (AP) — Tyler Bozak scored the clinching goal in the third round of the shootout and Toronto won its third straight by beating Buffalo.
Toronto earned its league-leading ninth shootout victory in its 13th shootout.
Reimer stopped 27 shots in regulation and overtime, while U.S. Olympic goaltender Ryan Miller made 36 saves for the Sabres.