They played so well that cameras caught Reaves singing along perfectly to Cab Calloway's Minnie the Moocher while sitting on the bench late in the game.
Marchessault has been pulling up to Stanley Cup Playoff games at T-Mobile Arena in a gold Lamborghini convertible with Golden Knights-logo decals and the team mantra "Vegas Born" on the doors.
Then Nosek added an empty-netter in Vegas' 6-4 victory in what was a sloppy but wild back-and-forth Stanley Cup Final curtain raiser on Monday.
But Ovechkin and the Capitals also are seeking the first title in franchise history and have been brilliant on the road in the playoffs, going 8-2 away from Washington D.C.
The Golden Knights were the last ones standing on Monday night.
Game 1 marked the first contest in the history of the 104-year history of the Stanley Cup Final to feature four lead changes.
Tom Wilson's fluky goal 1:10 into the third - tipped underneath the pads of Vegas goalie Marc-Andre Fleury, who lost a feel for the puck and kicked it into his own net - put the Capitals ahead, 4-3. "I remember everything", Marchessault said after the game. The referees huddled but decided not to issue a major penalty, instead giving Wilson two minutes for interference.
As incensed teammates flocked to Wilson, Marchessault headed to the locker room under his own power. You know, the reason we're actually here. The two teams combined for 62 shots on goal, and the third period alone featured four goals.
"I haven't obviously slowed it down and looked at it, but I think he'd probably say he shouldn't have admired his pass, and I'm just finishing my check", Wilson said. Nicklas Backstrom then gave the Capitals a 2-1 lead with 4:37 remaining with his fifth goal of the postseason.
Notes: The victor of Game 1 has lifted the Cup 78.2 per cent of the time since the best-of-seven format was introduced in 1939 (61 of 78). Vegas could be in trouble should the rest of the series continue to be a high-scoring affair, because that would seemingly favor Washington.