DENVER – Bruce Bochy shook his head for any number of reasons when Madison Bumgarner’s hand was broken in his last spring-training start. The manager kept coming back to how dominant Bumgarner looked, and what this season could be for the Big Fella.
Bochy’s vision is coming true, not under the damp, fickle skies of spring, but in the heat (and sometimes fog) of June and July.
Bumgarner did not win at Coors Field on Monday night. In fact, he and the Giants took a 5-2 loss that had to be frustrating given the nature of Colorado’s decisive three-run rally in the seventh inning.
However, another superb effort on the mound supplied more evidence that this could be the Summer of Bumgarner.
The lefty extended his scoreless streak to a career-high 22 innings over four starts before the fateful seventh inning of a game the Giants had led from the first pitch, when Gorkys Hernandez homered off Kyle Freeland. Buster Posey hit an RBI double in the third.
Bumgarner’s streak and 2-0 lead disappeared amid a hail of scratch hits, a rookie reliever who could not throw strikes and, of all things, a Brandon Crawford throwing error that broke a 2-2 tie in the seventh inning of a game the Giants had led from the first pitch.
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Bumgarner’s shot at the win ended after pinch-hitter Pat Valaika, DJ LeMahieu and Charlie Blackmon singled to start the seventh. LeMahieu hit a bloop to right, Blackmon a dribbler on the infield.
Bochy ended Bumgarner’s game after 89 pitches, a decision probably influneced by the fact that he had not retired Nolan Arenado in four plate appearances.
Bochy called on Reyes Moronta to face baseball’s biggest Giants-killer with the bases loaded and nobody out.
Moronta walked Arenado on five pitches to halve the Giants’ lead. Moronta seemed to avert disaster even as the tying run scored when he got Trevor Story to ground into a double play, then induced an Ian Desmond one-hopper to short for what should have been the third out.
But Crawford sailed his throw too high and wide for even Brandon Belt to catch, and Blackmon scored from third to give the Rockies the lead.
Colorado scored twice more off Ty Blach in the eighth to seal it.
Bumgarner did not have an easy time extending his scoreless streak early in the game. The Rockies loaded the bases in the first and third innings. He made a good pitch to escape the former. Left fielder Austin Slater saved his bacon on the latter.
Slater raced in and slid to catch what looked like a scoring single by Chris Iannetta off the bat. Three runs would have scored had Slater whiffed on what became the third out.
Slater already made a far more difficult catch to steal at least two bases from Noel Cuevas in the second inning.
Young legs, right?
The Giants did not escape the heat when they left Phoenix. Gametime temperature was 92 degrees with 11 percent humidity. Altitude was stable at a mile high.
The over-under on home runs in those conditions at Coors would have been pegged at “sweet mother of creation” if not for the ace-vs.-ace matchup.
Sure enough, the game’s first pitch left the yard.
Hernandez, who declared himself fit after slamming a foul ball off his ankle Sunday, sent Freeland’s outside corner fastball the other way into the right-field seats for his 11th home run.
The Giants took a 2-0 lead on a consummate Coors Field double by Posey, a hard grounder that shortstop Trevor Story was inches from stopping but then took ages to get to center fielder Charlie Blackmon because of how deep he has to play in this huge outfield.
Belt, on the move for four straight 3-2 pitches, had no trouble scoring from first.
Henry Schulman is a San Francisco Chronicle staff writer. Email: email@example.com Twitter: @hankschulman