Rockies win on inside-the-park HR in 9th over Giants

Colorado Rockies' Brandon Barnes slides home on his two-run inside-the-park home run off San Francisco Giants pitcher Sergio Romo during the ninth inning of a baseball game in San Francisco, Saturday, June 14, 2014.

Brandon Barnes hit a two-run, inside-the-park home run in the ninth inning and the Colorado Rockies rallied for the second straight day to stun the San Francisco Giants 5-4 on Saturday.

Charlie Blackmon singled with two outs off Giants closer Sergio Romo (3-3) before Barnes lined a hit to center field. San Francisco's Angel Pagan misplayed the ball and it skipped to the fence as Blackmon and Barnes raced around the bases.

Barnes, who had a walkoff triple to beat the Dodgers on June 7, had flown out to center in three consecutive at-bats before helping Colorado extend its winning streak to four games.

It's the second consecutive blown save and fourth this season for Romo, who gave up five runs in the ninth inning of Friday's 7-4 loss to Colorado.

Buster Posey's sacrifice fly in the seventh inning had given the Giants a 4-3 lead. Posey also doubled and homered to finish with a season-high three RBIs - the most by San Francisco's two-time All-Star in more than 11 months.

Hunter Pence hit his ninth home run of the year while Gregor Blanco had three hits for San Francisco.

It wasn't enough to prevent the Giants' fifth loss in six games.

Barnes is just the second opposing player to hit an inside-the-park home run at AT&T Park. Fernando Vina did it with St. Louis on May 9, 2000.

Rex Brothers (3-4) pitched one inning for the win and became the 76th pitcher in history to strike out the side on nine pitches. LaTroy Hawkins worked the ninth for his 13th save, although he had to wait to celebrate.

Angel Pagan appeared to ground into a game-ending double play and several Rockies players came out of the dugout to celebrate. San Francisco manager Bruce Bochy, who successfully overturned a call earlier in the game, again challenged the ruling. After a brief review, the umpires upheld the original call.

The Giants went into the game with the best record in the majors but were staggering on the heels of four losses in five games. They trailed late in this one, too, before Posey tied it with a two-run homer in the fifth then drove in Pagan with the go-ahead run in the seventh.

San Francisco's bullpen couldn't make it hold up.

Jean Machi pitched out of a two-on, two-out jam in the eighth before Romo took over in the ninth.

The Rockies scored twice off Giants starter Ryan Vogelsong in the second then took a 3-1 lead in the third following back-to-back doubles from Morneau and Josh Rutledge.

It could have been worse for Vogelsong, who needed instant replay to get out of a two-out jam in first after Rutledge appeared to leg out an infield single and load the bases. Bochy successfully challenged the call and Rutledge was ruled out to end the inning.

Posey's two-run homer off Christian Bergman in the fifth tied it.

Bergman lasted six innings in his second major league start. The Rockies' rookie allowed eight hits, struck out three and didn't walk a batter.

Pence homered off Bergman in the first.