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.