Guenther gave Arizona a 3-2 lead at 4:56 of the third period, scoring from the low slot off a pass from Alex Kerfoot after Crouse swatted the puck away from Sharks defenseman Mario Ferraro along the blue line.
“It was kind of a weird, broken play," Guenther said. "'Kerf' got the puck and I jumped into the hole and he made a nice play, and I just tried to get the shot off quick and it went in."
Said Sharks coach David Quinn: “We just weren't able to get the third goal, and then for them to get it, that easily was disappointing. I thought we didn't stick with it after that.”
Keller made it 4-2 at 14:13 when he skated into a drop pass from Schmaltz in the left circle and scored with a slap shot.
Schmaltz then shot into an empty net at 16:54 for the 5-2 final.
The Coyotes have outscored their opponents 9-0 in the third period in the past two games. They outscored the Vegas Golden Knights 6-0 in a 7-4 win on Friday.
“We were able to stay patient, not get too frustrated, and then bring it together in the third,” Guenther said. “We learned our lesson there (on Friday) with a really good third and kind of took the momentum from that game into tonight.”