By Jeremy Kahn

AP photo: San Francisco Giants catcher Buster Posey hits a three run homer in the first inning off Colorado Rocky pitcher Eddie Butler in the first inning of Saturday’s game at Coors Field

It maybe just the second month of the season, but Buster Posey came up with the biggest home run of the season for the San Francisco Giants.

Posey hit a three-run home run in the top of the eighth inning, as the Giants came back to defeat the Colorado Rockies 10-5 at Coors Field.

The three-run home run by Posey capped off a six-run eighth inning, as the Giants overcame a 5-4 deficit to defeat the Rockies.

It was the second three-run home run of the game for Posey, who also hit one in the top of the first inning. This was the third multi-home run game of Posey’s, two of them against the Rockies. Also the six runs batted in tie a career-high.

Things looked great for Madison Bumgarner to pickup his seventh win of the season, as he went six innings, allowing just one run on five hits, walking two and striking out six. Bumgarner also managed to get out of a bases loaded nobody out jam in the bottom of the sixth, his last inning of work.

Unfortunately, Bumgarner failed to get his seventh win of the season, as five Giants relievers were unable to hold the lead and the Rockies took a 5-4 lead, much to the delight of the partisan crowd at Coors Field.

Nolan Arenado came through with a two-run double and then Carlos Gonzalez gave them the lead with two-run home run to straightaway centerfield.

Asides from Posey’s three-run homer in the top of the eighth inning, Jarrett Parker came up with a run-scoring single and Gregor Blanco added a two-run double.

Cory Gearrin pitched 1.1 innings of scoreless baseball, as he picked up his first major league in exactly three years. Gearrin also got his first major league hit.

Denard Span was a late scratch with a sore right hip. As expected, the Giants placed Matt Cain on the 15-day disabled list with a strained right hamstring.