DENVER (AP) - Nolan Arenado completed the cycle with a three-run homer in the bottom of the ninth inning, and the Colorado Rockies stunned the San Francisco Giants by rallying for a 7-5 victory Sunday.

Arenado hit the first pitch he saw from All-Star closer Mark Melancon (1-2) into the left-field seats to finish a four-game sweep. The slugger was mobbed at home plate by teammates, with a frenzied sellout crowd chanting "MVP! MVP!"

With the best record in the National League, the surprising Rockies have won five straight overall and nine in a row against the Giants.

Last-place San Francisco has dropped six consecutive games and nine of 11.

Melancon retired his first batter, but three singles produced a run and brought up Arenado, who tripled in the first, singled in the fourth and had an RBI double in the sixth. He hit a 91 mph fastball for his 15th homer and first career cycle.

Rockies' Arenado gets his first ever career cycle, Colorado sweeps the Giants four games to none for the first time and remain atop the National League.