Robin Lehner had more trouble with one of his skates than he did with his former team.

Reilly Smith, Shea Theodore and the Vegas Golden Knights took good care of their goaltender Tuesday night.

Theodore and William Carrier scored 2:17 apart midway through the second period, Lehner made 19 saves against his former team, and the Golden Knights beat Chicago 4-1 in Game 1 of their Stanley Cup playoffs first-round matchup.

Smith scored twice in the third period as the top-seed in the Western Conference kept their scoring outburst from the round-robin seeding games going in the playoff opener. The Golden Knights scored 15 goals in the three seeding games and didn't slow down against Chicago.

Game 2 is Thursday.

"Goals are huge in the playoffs and sometimes it's just throwing pucks on net and then hoping for bounces," Smith said. "So we've got to continue to do that. The ice isn't great, so over passing doesn't really help, so we get pucks on net and try to crash it. Playoffs, this is where you score dirty goals, so we've got to continue to do that."

Lehner, who was traded from Chicago to Vegas in February, was the backbone of a Golden Knights defence that shut down their opponents. Lehner's biggest problem was a faulty skate blade that led to delays in the second period.

Chicago's veteran stars Patrick Kane, Jonathan Toews and Duncan Keith were mostly held quiet. Toews and Kane both hit posts, but combined the trio had just five shots on goal.

"What's so good on our team is everyone works back, everyone's blocking shots," Lehner said. "The [defence] was really good today about cleaning up the rebounds. They're a dangerous team so we just got to tighten up a little bit. I think we can be even better."

Lehner said he learned Monday morning he would start Game 1 rather than Marc Andre-Fleury. Lehner played two of the three games during the round-robin.

"There's no better duo in the NHL for goalies," Vegas centre Jonathan Marchessault said. "[Fleury] is an amazing team player as well. He was the first to cheer the boys on in the locker room, and he's such a leader on and off the ice. I think whoever's in that, we we feel 100% confident as a group."

David Kampf scored short-handed for Chicago in the second period thanks largely to the work of Brandon Saad forcing a turnover, but that was the extent of their scoring.

"I think we'll definitely have adjustments, but for the most part I think we did a pretty good job," Saad said. "We've got to know that's how the series is going to be. We can't just when things aren't going our way get frustrated or if they score a goal, kind of get let down."

Theodore scored his third goal of the post-season, flicking a wrist shot past Chicago goaltender Corey Crawford from the right circle. Minutes later, Carrier jabbed home a loose puck in front of Crawford's net after Ryan Reeves had thrown the puck on net to give the Golden Knights a 2-0 lead.

Smith assisted on Theodore's opener before finding the net himself twice in the final 20 minutes. Both goals were assisted by Marchessault, the second allowing Smith to skate in free and lift a backhanded shot over Crawford's glove.

Vegas earned the top-seed in the Western Conference after winning the Pacific Division and going 3-0 in the round-robin qualifying round to determine playoff seeding.

But Chicago was an unexpected first-round opponent for the Golden Knights. As the No. 12 seed, Chicago was impressive in dispatching heavily-favoured Edmonton in four games in the qualifying round.