The NL West-leading Rockies snapped Florida's four-game winning streak and improved to 8-2 on the road.
Hammel (2-1) allowed seven hits and one run. Three relievers combined to pitch 2 1-3 perfect innings, and Huston Street pitched the ninth for his seventh save in as many chances.
Colorado's bullpen has allowed just two runs in the past 22 1-3 innings
The Rockies, who were one-hit by Anibal Sanchez in a defeat Friday, won with only six hits. Troy Tulowitzki had an RBI single in the first inning, and Ty Wigginton put Colorado ahead to stay with a sacrifice fly in the sixth.
The Marlins gave their biggest crowd since opening day little to cheer about. Announced attendance was 37,381, but the actual turnout was about 25,000.
Florida shortstop Hanley Ramirez made his fifth error of the season on a bad throw and went 0 for 4, dropping his average to .194. He's in a 2-for-23 slump and drew scattered boos when he grounded out in the eighth.
Javier Vazquez (1-2), making his first start in eight days, went six innings. He allowed four hits, five walks and three runs.
Colorado broke a 1-all tie with two runs in the sixth. Todd Helton doubled and took third when left fielder Emilio Bonifacio took a zigzag route and let Seth Smith's deep fly fall for a double. Wigginton's flyout put Colorado ahead, and Hammel laid down a sacrifice bunt to score Smith from third.
Tulowitzki was only 3 for 23 with runners in scoring position before his singled home a run in the first after Vazquez issued two walks.
Florida's John Buck tied the game in the third when he doubled and later came home on Chris Coghlan's sacrifice fly.
NOTES: Less than 24 hours after throwing 123 pitches in a one-hitter, Sanchez said he felt fine. He was hit in the right leg by a hard grounder in the seventh inning. ... The Puerto Rican salsa band El Gran Combo performed a postgame concert. Their fans include Marlins manager Edwin Rodriguez, who said the band played at his high school during his senior year in 1978. ... Rockies catcher Chris Iannetta (stiff back) was held out of the starting lineup but was available off the bench. ... Right-handed hitters are 3 for 35 (.086) this season against Marlins RHP Josh Johnson, who starts the final game of the series Sunday.
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