Cody Ross homered and drove in five runs, Chris Volstad tossed two scoreless innings to win his major league debut and the Florida Marlins beat the Colorado Rockies 10-5 Sunday.

Ross knocked in 15 runs in the four-game series after coming to Colorado with just 12 RBIs this season.

Colorado had won five straight but got a rare bad outing from ace Aaron Cook, who had his worst outing of the year on the day he made his first All-Star team. Cook allowed seven earned runs and 11 hits in 7 1-3 innings.

Volstad, who was called up from Double-A Carolina before the game, escaped a based-loaded jam in the sixth when Clint Barmes flied out weakly to center, preserving Florida’s 5-4 lead.

The 21-year-old right-hander was the 16th overall selection in the 2005 draft.

Ross gave Florida a 5-4 lead when he lined a two-run single just past the outstretched glove of first baseman Jeff Baker in the top of the sixth, and he chased Cook with a two-run homer, his 15th, in the eighth that made it 7-4.

The Rockies pulled to 7-5 in the eighth when Omar Quintanilla scored on Renyel Pinto’s wild pitch, but Florida added three insurance runs in the ninth, including Ross’ RBI double.

Cook (11-6), who was coming off a 79-pitch shutout of San Diego in his last outing, failed in his quest to become the first Rockies pitcher to win a dozen games before the All-Star break.

He allowed Paul Hoover’s RBI single in the second and gave up two more runs in the third, when starting pitcher Mark Hendrickson led off with a single and scored on Wes Helms’ sacrifice fly.

Cook made up for it by knocking in a run with a double and scoring on Ryan Spilborghs’ two-run single that gave Colorado a 4-3 lead an inning later.

After hitting 10 home runs over the previous two games _ the most in franchise history _ the Rockies went long just once Sunday, on Brad Hawpe’s 13th homer in the second inning.

The teams combined for 79 runs in the four-game series, including Friday night’s 18-17 slugfest won by the Rockies, who overcame a nine-run deficit in the first game in nearly 30 years in which each team scored at least 17 times.

Notes:@ Hendrickson, who hasn’t won since May 25, allowed four earned runs and six hits in four innings. ... Volstad took the roster spot of LHP Taylor Tankersley, who was optioned to Triple-A Albuquerque after Florida’s 12-6 loss to Colorado on Saturday night. ... Colorado hasn’t swept Florida since taking three from the Marlins in April 2006.