Game 2 goes Wednesday in Sin City before the series switches to Washington for Games 3 and 4.
Red Capitals sweaters speckled the steel gray crowd at T-Mobile Arena, but the night ultimately belonged to Vegas.
The Capitals then went ahead for the first time just 42 seconds later when Backstrom, who suffered a hand injury in the second round that forced him to miss four games, scored his fifth.
Bellemare, who didn't have a point, was 6-4 on faceoffs and a plus-3 while playing just under 12 minutes. "I don't know if you guys knew, but I told everybody I was going to save them for the playoffs".
"I never saw it coming", Marchessault said.
The Capitals pressed late with Holtby on the bench, but Lars Eller flubbed a golden opportunity on the doorstep with Fleury at his mercy before Nosek sealed it with three seconds left.
When Devante Smith-Pelly blocked a pass in the defensive zone but botched the clear, Shea Theodore collected the puck and sent it to Nosek at the side of the net, and the fourth-line winger slapped it past Braden Holtby.
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Wilson delivered a blindside hit on Jonathan Marchessault with the puck nowhere near the Vegas centre in the immediate aftermath. "I remember everything. It was a late hit. the league is going to take care of it".
"Real happy for them", Fleury said of Reaves and Nosek.
Wilson was suspended for three games against the Pittsburgh Penguins in the second round of the postseason following a high hit that broke Zach Aston-Reese's jaw.
"I have a very fond respect for George", Wilson said. I haven't slowed it down.
With a series win in game 7 against the Tampa Bay Lightning in the Eastern Conference Final on May 23, the Washington Capitals are heading to the Stanley Cup finals for just the second time since joining the National Hockey League in 1974-75.
The Eastern Conference champion Capitals hadn't given up this many goals in 29 games since March 18, but they hadn't seen anything like this charmed run by the upstart Knights. He added that the Golden Knights have the "best fans and best arena in hockey, hands down-it's always insane here". On three occasions, the overtime victor has been scored within the first two minutes, and the latest single-overtime victor was an absolute buzzer-beater, coming when Mike Bossy scored with two ticks remaining in the first overtime of Game 1 in the 1982 Stanley Cup final.
Strangely enough, none of the 10 goals came off the stick of Alex Ovechkin, who only had two shots on net, though he did have an assist in the game. "The fans have been great, and they brought it tonight".
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The European soccer season comes to a close on Saturday, as Real Madrid and Liverpool meet in the Champions League final in Kiev . Knowing Liverpool as a club, the people I had spoken to about Liverpool also, I knew Liverpool belongs to the Champions League.
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The euro's surge meant that the dollar pulled back from a six-month peak of 94.30 hit against a basket of rivals on Friday. The country could be headed for another election in coming months . "We don't think this rally can be sustained".
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But the France global is linked with a move to Barcelona in the close-season despite being contracted until 2022. The France forward was quoted by Marca as saying after the game: "Now is not the time to talk about the future".