Ott blocked a neutral-zone pass from Avalanche defenseman Adam Foote and took off. Foote couldn't catch him, and Ott beat Aebischer.
Jason Arnott and Scott Young also scored for Dallas. Milan Hejduk, Riku Hahl and Steve Konowalchuk had Colorado's goals.
Blues 4, Sharks 1
At St. Louis, Sillinger got his first playoff hat trick and Dallas Drake had a goal and an assist.
Sillinger, acquired March 4 from Phoenix and playing for a record-tying 10th NHL team, provided a boost for the Blues down the stretch, and now again in the playoffs.
"I remember a couple of years ago I was in the playoffs with Ottawa and we lost our first two home games and we went to Toronto and guys were tippy-toeing around," Sillinger said.
"Now, we lose our first two games at San Jose and we come home and the music is going and guys are confident.
"This is a team that believes in itself."
Chris Osgood made 17 saves and lost his shutout when Jonathan Cheechoo scored his first playoff goal early in the third period.
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