"I feel good, seeing the puck really well, thanks to the guys," said Grubauer, who has two shutouts this season and 11 in the NHL. "They're making things easy. If you play the way we're playing, it makes things easy for me back there. That's what we need to do."
Grubauer (18-11-4) matched his NHL career high set last season with his 18th win. He's won four straight starts while posting an 0.75 goals-against average and .974 save percentage.
WATCH: [All Senators vs. Avalanche highlights]
Valeri Nichushkin, Mikko Rantanen and Gabriel Landeskog scored for the Avalanche (33-16-6), who have won five straight games and are 8-1-0 in their past nine. Colorado moved within one point of the first-place St. Louis Blues in the Central Division.
"I didn't think we had our best legs," Colorado coach Jared Bednar said. "We were probably a little bit tired coming home (after a five-game road trip), getting to altitude. It seemed like we were a little bit mentally tired too. Overall, I didn't mind our game. It's a tough game to play after a long road trip. Coming home for that first one on not much rest, I thought our guys did a nice job tonight sticking with it."