There was nothing melodramatic about Trevor Story’s bat flip, but his 461-foot, three-run homer was epic.

The Rockies’ shortstop crushed a first-pitch changeup from Genesis Cabrera in the seventh inning to carry the Rockies to a 3-2 win over St. Louis on Saturday night at sold-out Coors Field.

Colorado’s fragile bullpen, the worst in baseball based on ERA, bent but didn’t break. The Cardinals scored twice in the eighth against right-hander Carlos Estevez, pounding out three hits, with RBI singles by Paul Goldschmidt and Yadier Molina. But with runners on first and third, Estevez fanned Harrison Bader for out No. 3.

Daniel Bard walked Paul DeJong to open the ninth, got the next two outs, but gave up a cueball double down the left-field line to Tommy Edman. Bard was a bit wild, but he struck out Dylan Carlson swinging over a 3-2 slider to close out the game. It was Bard’s 12th save, and he pumped his fist when he got it.

The Rockies, who have won five of their last six games, improved to 30-17 at home.

The 48,182 in attendance on fireworks night sure got their money’s worth.

First came a classic pitching duel between two lefties — the Cardinals’ Wade LeBlanc and Colorado’s Kyle Freeland. They also saw Colorado third baseman Ryan McMahon make seven assists, two short of the club record of nine set by Jeff Cirillo on July 23, 2001, against San Francisco.

LeBlanc pitched 5 2/3 scoreless innings, giving up just three hits, with three walks and three strikeouts.

Despite pitching with a sore right hamstring, Freeland was one-third of an inning better than LeBlanc. Freeland pitched six scoreless innings, also allowing just three hits, walking three and striking out three. Former teammate Nolan Arenado raked a two-out double to right-center off Freeland in the sixth, but Freeland coaxed Molina to ground out to McMahon to end the frame.

Colorado’s starting pitchers, who have been remarkably good at Coors Field all season, have a collective 1.35 ERA in the first six games of the current homestand, with 26 strikeouts and only nine walks.

Until Story cranked out his home run in the seventh, the Rockies were 1-for-8 with runners in scoring position. That, after going 1-for-14 in a 9-3 loss to St. Louis on Friday night.

Colorado almost scored in the fourth inning, and would have, save for a tailormade carom and an excellent play by Goldschmidt at first.

With one out, McMahon on second and C.J. Cron on first, Elias Diaz smashed a grounder to DeJong at short, who tossed the ball to Edmundo Sosa, forcing Cron out at second. Sosa’s throw to first skipped past Goldschmidt, but Goldschmidt barehanded the carom off the wall and threw out McMahon trying to slide into home.