DENVER -- Daniel Descalso's two-run homer in Saturday night's sixth inning enabled the Colorado Rockies to inch ahead and helped them claim a 5-3 victory over the San Francisco Giants, ending the defending World Series champions' eight-game winning streak.
"It was a good run," Giants manager Bruce Bochy said.
San Francisco's Yusmeiro Petit pitched capably for five innings in his first start of the season and nearly escaped the sixth inning with a 2-2 tie. Then Brandon Barnes beat out the back end of a potential inning-ending, double-play grounder he hit. Up came Descalso, who lined a first-pitch changeup over the right-field barrier.
"I had a hole open on the right side, and I was just trying to get something to pull through that hole," Descalso said. "He threw me a changeup out over the plate, and I was able to drive it into the seats."
Colorado starter David Hale subdued the Giants, limiting them to three runs (two earned) in 6 2/3 innings in the second half of a day-night doubleheader. Like the earlier game, which the Giants won, 10-8, rain interfered with the start of this contest, delaying it 58 minutes.
MOMENTS THAT MATTERED Descalso rarity: To say Descalso's home run came from an unlikely source would be a vast understatement. At the time of the blast, he had hit just 11 home runs in 1,438 plate appearances, which averages out to just one long ball almost every 131 times at bat. Before going deep, Descalso also had batted 75 times at Coors Field without a home run.
"He's got some sneaky power," Rockies manager Walt Weiss said. "He's not a guy you count on to hit the ball in the seats, but if you make a mistake, he'll hit it out. He's a tough out, versatile player."
Bad baserunning: A ninth-inning rally ended before it began when Gregor Blanco tried to advance from second base to third on pinch-hitter Angel Pagan's flyout to center. Third baseman Nolan Arenado feigned nonchalance as Charlie Blackmon's one-hop throw arrived, and Blanco was tagged out. More >
Brooks and done: Before Saturday's doubleheader, the Rockies activated reliever Brooks Brown from the disabled list and immediately tossed him back into the fire. With two outs in the seventh, he entered in a one-run game and the tying run on second. Brown fell behind, 2-1, on three straight changeups to Nori Aoki but evened the count with a 94 mph fastball. A fourth changeup retired Aoki on a liner to left, and Colorado added an insurance run in the bottom half. Brown faced just the one batter.
The Giants appeared to have a 3-2 lead after Aoki's fifth-inning single, but video evidence showed that Rockies catcher Michael McKenry had, in fact, tagged Casey McGehee on the thigh before he touched home. Weiss successfully challenged the call, and the reversal subsequently gave Carlos Gonzalez his second outfield assist of the season.
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Descalso's blast was the 70th home run Petit's served up in his career, but it was just the third he's ever surrendered to an eighth-place hitter.
WHAT'S NEXT Rockies: Many people find Sundays relaxing, but the Rockies sure haven't. They are winless in five Sunday games this season and have been outscored in those contests a combined 31-16. Chad Bettis starts the 2:10 p.m. MT series finale.
Giants: Don't bother looking for a pattern in the Giants' series finales. They're 6-6 in those games entering Sunday's 1:10 p.m. PT getaway-day special against the Rockies. San Francisco will give the ball to right-hander Tim Hudson, who is 0-2 with a 6.80 ERA in nine career starts at Coors Field.
Chris Haft is a reporter for MLB.com. Read his blog, Haft-Baked Ideas, follow him on Twitter at @sfgiantsbeat and listen to his podcast. Dargan Southard is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.