Ryan O'Reilly, Ivan Barbashev and Zach Sanford scored to help the Blues beat the Vegas Golden Knights 3-1 on Monday night.
St. Louis acquired O'Reilly from the Buffalo Sabres last offseason for a 2019 first-round draft pick, a 2021 second-round pick plus Tage Thompson, Vladimir Sobotka and Patrik Berglund.
Buffalo never made the playoffs in O'Reilly's three seasons there. He reached the playoffs twice with Colorado, the last time during the 2013-14 season. Now he's on the cusp of getting back into postseason play with the Blues.
St. Louis, which has six games to play, sits third in the Central Division and is closing in on a playoff spot. The Blues remained two points behind second-place Nashville, which beat Minnesota 1-0.
Jordan Binnington made 24 saves for his 21st victory of the season. He is one win short of matching Jake Allen's record set in 2014-15 for the most by a Blues rookie goaltender.
William Karlsson scored for Vegas, which could have clinched a playoff berth with a win. The Golden Knights are in third place in the Pacific Division, 11 points ahead of Arizona.
The Blues completed a sweep of their four-game homestand, outscoring the opposition 19-8. They won all three meetings with the Golden Knights this season and outscored them 12-5 overall. St. Louis is 4-0-2 all-time against Vegas, which reached the Stanley Cup Final as an expansion team last year.
Barbashev has four goals and five points in his last three games.
The Blues are at the New York Rangers on Friday night.