The winner officially went to Brassard, whose wrist shot from in front beat Fleury cleanly but caromed back onto the ice. Referee Steve Kozari waved it off, however, and play continued before Pouliot slammed the puck into a wide-open net moments later for good measure.
"I found out way later [Brassard] got the goal," Pouliot said. "Good for him. We've been playing well against Philly and now tonight. We deserved that."
Pouliot and Brad Richards gave the Rangers an early 2-0 lead. Henrik Lundqvist stopped 34 shots and stuffed a late Pittsburgh breakaway in the final seconds of regulation. The line of Pouliot, Brassard and Mats Zuccarello combined for 14 points in New York's four regular-season meetings with the Penguins.
Blackhawks 5, Wild 2 • In Chicago, Patrick Kane scored two goals in the third period, including a terrific dash through the Minnesota zone for the tiebreaking score, in Game 1 of the Western Conference semifinals.
Bryan Bickell also scored twice for the Blackhawks, who have won five in a row after losing their first two playoff games. Marian Hossa had a goal and an assist as the defending Stanley Cup champions made the most of two costly high-sticking penalties on Minnesota defenseman Jonas Brodin.
Game 2 of the best-of-seven series is Sunday afternoon.
• N.Y. Rangers 3, Pittsburgh 2 (OT)
Rangers lead series 1-0
• Chicago 5, Minnesota 2
Hawks lead series 1-0
• Montreal at Boston, 10:30 a.m., Ch. 5
Canadiens lead series 1-0
• Los Angeles at Anaheim, 6 p.m., NBCSN