SAN FRANCISCO — Hunter Pence hit a three-run homer in the first inning that held up, Buster Posey added a late RBI single and the San Francisco Giants snapped the Colorado Rockies’ five-game winning streak with a 4-2 victory on Monday night.

Madison Bumgarner (2-0) won his sixth in a row against the Rockies and owns a seven-start unbeaten run in the rivalry. The left-hander began his career 0-3 against Colorado in five starts.

He struck out five and walked five in 5 2/3 innings Monday, allowing two runs and five hits.

One of those was Carlos Gonzalez’s long two-run homer to right in the third. The ball bounced off the pathway and splashed into McCovey Cove.

San Francisco extended its winning streak against the Rockies to seven games and bounced back from a 14-3 loss to St. Louis a day earlier when ace Matt Cain was tagged for nine runs in the fourth inning.

Michael Cuddyer had two hits and stole his first base for a Rockies team that had won five in a row since losing its opener 5-4 in 10 innings at Milwaukee. Dexter Fowler had his six-game hitting streak to start the season snapped as he went 0-for-4 with two strikeouts.

Pence sent the first pitch he saw from Jorge De La Rosa (0-1) deep into the bleachers in left-center for one of the hardest, longest balls he has hit at home since joining the Giants last July. Pablo Sandoval singled twice and scored a run.

The reigning World Series champions returned to a more normal routine after three straight days of celebrations — the flag raising Friday for the home opener, Posey’s NL MVP presentation Saturday and then Sunday’s ring ceremony.

Bumgarner pitched a 1-2-3 first, then issued at least one walk in each of the next four innings. After Cuddyer drew a leadoff walk in the fourth, Bumgarner was helped by a double play to get out of it unscathed. He walked Yorvit Torrealba to start the fifth, then Eric Young Jr. one out later before Bumgarner escaped another jam.

He is off to a solid start after struggling last postseason. The lefty, who spent the winter working on his mechanics, is trying to build on a 2012 season in which he won a career-best 16 games and had a 2.33 ERA in 14 home outings.

Cuddyer hit a one-out single in the sixth and Chris Nelson had an RBI single two batters later. Giants manager Bruce Bochy called for Santiago Casilla as Bumgarner walked off to a standing ovation.

Casilla went 1 1-3 perfect innings, Jeremy Affeldt pitched a clean eighth and Sergio Romo allowed Josh Rutledge’s leadoff double before striking out the side for his fourth save as the Giants retired 10 of the final 11 Rockies batters.

Posey’s two-out single in the eighth provided some insurance.

De La Rosa allowed six hits and his only runs on Pence’s homer, struck out three and walked one in a 76-pitch outing over six innings. He is 0-4 in his last seven starts dating to 2012.

Colorado starters reached 109 straight games without throwing 100 pitches, the longest such streak since pitch count data began in 1988.

The Giants went 14-4 against the Rockies last season for their most wins in the series, including 7-2 at AT&T Park.

Hunter Pence, Pablo Sandoval, Marco Scutaro

San Francisco’s Hunter Pence, right, is congratulated after hitting a three-run homer to score Pablo Sandoval (48) and Marco Scutaro (19) in the Giants’ 4-2 home win over Colorado. AP photo

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