Marco Scutaro homered off closer Santiago Casilla to lead off the ninth inning and lift the Colorado Rockies past the mistake-prone San Francisco Giants 5-4 on Tuesday night.
Scutaro smacked a 92 mph fastball from Casilla (0-2) just over the left-field wall for his first home run of the season after Colorado blew a three-run lead in the eighth.
Troy Tulowitzki, Michael Cuddyer and Carlos Gonzalez each drove in a run as the Rockies took advantage of three Giants errors to snap a four-game losing streak.
Rex Brothers (2-2) struck out Brandon Belt and Melky Cabrera with the bases loaded in the eighth. Rafael Betancourt struck out Nate Schierholtz looking with two on in the ninth for his seventh save in eight chances.
Solid outings by both starters were washed away.
Colorado's Jeremy Guthrie allowed four hits and one unearned run in 5 1-3 innings in his first start since April 22. He had gone on the disabled list after falling off his bicycle on the way to the ballpark last month.