Jay Bruce of the Mets is congratulated by Curtis Granderson...

Jay Bruce of the Mets is congratulated by Curtis Granderson after hitting a home run in the fourth inning against the Rockies at Coors Field on Aug. 2, 2017, in Denver. Credit: Getty Images / Matthew Stockman

DENVER -- The Mets caught a glimpse of Amed Rosario’s blazing speed and rallied from a five-run deficit on Wednesday night to beat the Rockies, 10-5.

“You’re never out of a game here,” manager Terry Collins said.

The Mets trailed 5-0 through three innings, when Chris Flexen’s second big-league start was cut short because of a blister. But Coors Field has hosted plenty of wild comebacks, and the Mets began one of their own.

Jay Bruce hammered a two-run homer, his 29th, to get the Mets on the board in the fourth. In the fifth, the Mets tacked on two runs, this time courtesy of Rosario. In his second big- league game, the 21-year-old crossed a few firsts off his list and flashed the speed that scouts have longed raved about.

Curtis Granderson reached on an error then scored when Rosario used his speed to turn a liner down the leftfield line into a triple. With one swing, he collected his first extra-base hit and his first RBI. A moment later, Travis d’Arnaud’s groundout allowed Rosario to score his first run.

“I’m always thinking I’m taking an extra base when I can,” Rosario said through a translator.

In the sixth, Yoenis Cespedes laced a game-tying double ahead of Granderson, whose three-run homer chased Rockies starter Tyler Chatwood after allowing eight runs (seven earned) in 5 1/3 innings. The Mets (49-56) sent 11 batters to the plate in the inning, scoring six runs with seven hits.

But the rally was made possible by the bullpen, which strung together zeros.

Rookie Chase Bradford started the chain with a pair of scoreless innings in relief of Flexen. Bradford picked up his first victory.

“It’s throwing strikes mostly, pounding the strike zone,” said Bradford, who challenged hitters even when the altitude robbed his sinker of its movement.

Notes & quotes: David Wright began “low-level” baseball activities on Wednesday, assistant general manager John Ricco said. Wright, 34, has been sidelined since spring training with a shoulder impingement, stemming from neck surgery last year to repair a herniated disc. He continues to battle the back condition spinal stenosis. Ricco stopped short of saying that Wright would return this season . . . Closer Jeurys Familia reached an important milestone by throwing his first bullpen session since undergoing surgery to repair a blood clot near his shoulder. It’s the strongest sign yet that he should return before season’s end . . . Lefty reliever Josh Edgin cleared waivers and accepted an assignment to Triple-A Las Vegas.