SAN JOSE, Calif. — Joonas Donskoi wasn't even born when the San Jose Sharks started in 1991 and hadn't taken part in any of a series of playoff disappointments that haunted the franchise over the years.

On a team full of big-name stars, it was a Finnish rookie who wasn't even supposed to be ready for the NHL this season who delivered perhaps San Jose's biggest goal ever.

Donskoi's goal 12:18 into overtime ended the first Stanley Cup Final game ever in San Jose and helped the Sharks bounce back from two straight road losses to beat the Pittsburgh Penguins, 3-2, in Game 3 on Saturday night.

“It's game in, game out different guys stepping up to the plate,” center Joe Thornton said. “It was huge he scored. Some clutch goals. He's always around the puck.

Former Washington Capital Joel Ward tied it midway through the third, Justin Braun also scored and Martin Jones made 40 saves to help the Sharks cut Pittsburgh's series lead to 2-1 with their first victory ever in the Final.

Ben Lovejoy scored and assisted on Patric Hornqvist's goal that gave the Penguins a 2-1 lead heading into the third. But Matt Murray let Ward's tying goal in off his glove and then allowed the winner as Pittsburgh lost for just the second time in 51 games when leading after two periods this season.

In an overtime period controlled mostly by Pittsburgh, San Jose got the only goal from a player whose signing out of Finland in May 2015 got little attention. But Donskoi has been a major reason for San Jose's success this season, solidifying himself as a top-six forward who can control possession for his team.

Chris Tierney got the puck to Donskoi behind the net. Donskoi skated out front where he beat Murray high to the stick side, setting off a wild celebration in an arena that was full of tension all night.

“It was a little bit of relief,” Tierney said. “It was finally nice to break through. It kind of felt like, `OK. We now can get the next one.'?”

NOTES: The Penguins fell to 4-3 in OT this postseason. ... Pittsburgh blocked 38 shots, including 12 from Brent Burns. ... Sharks F Tomas Hertl missed the game with a lower-body injury.