The Blues (40-27-8) gained on the Nashville Predators, who lost 5-0 at the Winnipeg Jets, and moved six points ahead of the Dallas Stars, who lost 3-2 to the Pittsburgh Penguins. Nashville has played one more game than St. Louis, which has won three in a row.
"We need to make a push," said Blues forward Vladimir Tarasenko, who had a goal and an assist. "Whatever other teams are playing doesn't matter, it's seven games left. Every point matters, especially after last year, and we know this. Just try to focus on our game."
WATCH: [All Lightning vs. Blues highlights]
The Lightning (58-14-4), who have clinched the Presidents' Trophy, had their seven-game winning streak end and remain four wins from tying the NHL record for one season (Detroit Red Wings went 62-13-7 in 1995-96) with six to play.
"Took us a little bit to get our legs underneath us, and for obviously the final two periods, I thought we played pretty darn well," Tampa Bay coach Jon Cooper said. "We had some real good looks, they just didn't go in, and then we got the unfortunate offside, but it was offside, so it's tough."