By Jeremy Kahn

Nolan Arenado did something against Sergio Romo that was only accomplished one other time during the 2014 season.

Arenado hit a two-run double off of Romo in the bottom of the ninth inning, as the Colorado Rockies defeated the San Francisco Giants 5-4 at Coors Field.

It was only the second blown save of the season for Romo, who saw his record fall to 3-1 on the season.

The Arenado double bounced off the wall to score Troy Tulowitzki with the tying run and motoring Carlos Gonzalez, who was running from first base with the winning run.

It was the second straight walkoff win for the Rockies, who defeated the San Diego Padres on a Justin Morneau two-run home run in the bottom of the 10th inning on Sunday afternoon.

The Giants took a 4-3 lead in the top of the ninth inning, as Tyler Colvin hit a RBI double against Rockies closer and former Giants reliever LaTroy Hawkins.

Wilin Rosario drove in three of the Rockies five runs on the evening, as he hit a RBI double and a two-run home run, as he recently returned to the Rockies lineup after missing 12 games because of a viral infection that caused him to lose nearly 10 pounds.

Madison Bumgarner was his steallar self again, as he went six innings, but gave up the game-tying home run to Rosario in the bottom of the sixth inning.

Bumgarner set a Giants team record by allowing three runs or less in his 18th consecutive road starts, surpassing Ed Whitson.

The Giants scored three of their four runs in the top of the fifth inning, as they were helped by a overturned foul ball that turned into a fair ball.

Colvin hit a double that dropped on the foul line that was called foul, but Bruce Bochy challenged the call and it was overturned..

Gregor Blanco then hit a two-run triple and then Hunter Pence hit a slow roller that Tulowitzki was unable to clean fieldly.