Janmark increased the lead to 3-0 at 4:39 of the second period when he scored from the left face-off circle after Anaheim defenseman Jamie Drysdale cleared the puck from the crease following a scramble in front.
"I think I've been feeling pretty good lately," Janmark said. "Some games you get more looks when you have the jump. The way the game was going in the second period, I think all the lines had a little more space."
Janmark was stopped by Gibson on a penalty shot at 18:21 after Josh Manson was called for holding the stick.
"I talked to our guys after the game here," Getzlaf said. "This time of year it's tough to play. This is where you separate yourself. There's good starts and good finishes, but if you can play the meat of the season above .500 and play hard and keep that passion going, it really rolls over the rest of the way."
NOTES: Ducks forward Sam Steel had two shots on goal in 11:51 after being activated from NHL COVID-19 protocol. … Golden Knights forward Mark Stone missed a second straight game with an upper-body injury and remains day to day. … Defenseman Alex Pietrangelo and forward Evgenii Dadonov each returned for Vegas after missing two games in protocol. Pietrangelo had one shot in 21:07, and Dadonov had three shots in 17:35. … Golden Knights coach Peter DeBoer returned after missing one game in protocol. … Vegas won 62 games in 2021, the most in the NHL. … It was the first of what is now an eight-game homestand for the Golden Knights through Jan. 20; the NHL on Friday postponed their games Jan. 14 at the Edmonton Oilers and Jan. 15 at the Calgary Flames due to attendance restrictions in certain Canadian cities because of COVID-19 concerns.