The Avalanche had two power-play opportunities in the first period, but didn't capitalize and would head into the first intermission with a tied 1-1 score against the Golden Knights as they found the back of the net late in the frame.
Colorado had nearly doubled its lead off a Grade A look setup by MacKinnon and Rantanen, but Rantanen's shot ricocheted off the crossbar. Vegas countered the other way and cashed in on their chance as Mark Stone carried the puck ino the offensive zone and dropped a pass back to Nic Hague. The blueliner fired a high shot on net and Amadio redirected it past Georgiev at 17:02.
The Golden Knights extended their lead 3-1 - as Roy netted both goals - with a dominant second period where they outshot the Avalanche 15-9.
Vegas took its first lead of the game at 7:14 as they put the pressure on in Colorado's zone. Georgiev had kicked out a rebound and Keegan Kolesar won a wall battle to retrieve it before dropping it into the left faceoff circle. Roy skated into the loose puck and ripped his shot past Georgiev.
The Golden Knights then took a 3-1 lead at 14:46 as they quickly exited their zone and attacked Colorado with a three-on-two rush. Just as the Avalanche forwards backchecked, Roy took a pass from William Carrier, skated into the top of the right faceoff circle and zipped his wrist shot through Georgiev's pads.
The Avalanche tightened up their five-on-five play - outshooting the Golden Knights 11-6 - in the third period and were awarded two power plays, but only mustered one goal midway through the frame and were unable to overcome the two-goal hole they dug themselves into.
Rantanen trimmed Colorado's deficit down 3-2 at 11:07 on a persistent effort. The top line of the Avalanche once again combined to get on the scoresheet as MacKinnon sent a pass out to the flank for Lehkonen. The Finnish forward - while battling off a Vegas blueliner - managed to center the puck on net and Rantanen jammed the puck past Thompson's pads as a scrum ensued. The play required extra video angles to confirm that the puck did in fact, cross the goal line.