PHOENIX — Madison Bumgarner pitched seven strong innings and the San Francisco Giants opened defense of their third World Series title in five years with a 5-4 win over the Arizona Diamondbacks on Monday night.
Bumgarner (1-0) was the NLCS and World Series MVP last year and was sharp to start the 2015 season, allowing a run on six hits.
The Giants lost power-hitting Pablo Sandoval during the offseason and were without injured right fielder Hunter Pence, but made up for it by stringing together 10 hits in four-plus innings against Josh Collmenter (0-2).
Angel Pagan had a pair of run-scoring singles and Brandon Crawford hit a two-run double for the Giants.
Diamondbacks pinch-hitter Jake Lamb hit a three-run double off Sergio Romo in the eighth, but Jeremy Affeldt stranded two runners to end the inning. Santiago Casilla worked a perfect ninth for the save.
Bumgarner had one of the best postseason runs in major league history, earning two wins in the World Series and a five-inning save in Game 7 on two days' rest.
The left-hander wasn't exactly sharp in spring training, going 0-3 with a 3.70 ERA, but said he felt good and would be ready for the start of the season.
He was right.
Bumgarner left a pitch up in the third inning to Mark Trumbo, who hit a run-scoring triple that nearly went out in the deepest part of the park.
Other than that, Bumgarner had the Diamondbacks under control, aided by double plays in the fifth and sixth.
Collmenter has been Arizona's jack-of-all trades during his four seasons in the desert, filling in wherever the Diamondbacks needed him, whether it was as a starter or long relief.
The over-the-top-throwing right-hander was rewarded for his workmanlike efforts by getting the ball on opening day.
San Francisco's top three hitters, Nori Aoki, Joe Panik and Pagan, greeted him with one hit after another, going a combined 8 for 9 through the first five innings.
Pagan had a pair of run-scoring singles, Buster Posey hit a sacrifice fly and Crawford a two-run double in the fifth to put San Francisco up 5-1.
Collmenter allowed five runs in 4 2-3 innings.
Giants: Pence, who could be out a few more weeks with a broken forearm, had played 383 straight games, the longest active streak in the majors.
Diamondbacks: Arizona opened the season with two starting pitchers on the DL: Patrick Corbin and Bronson Arroyo, who are both recovering from Tommy John surgery last season.
Giants: Right-hander Ryan Vogelsong was moved up to start Tuesday night against the Diamondbacks in place of Jake Peavy, who struggled with a “dead arm” in his final three spring starts. Peavy is expected to be back in the rotation for the next series against San Diego later this week.
Diamondbacks: Right-hander Rubby De La Rosa will make his Arizona debut against the Giants after the Diamondbacks acquired him an offseason trade that sent left-hander Wade Miley to Boston. De La Rosa was 4-8 with a 4.43 ERA in 18 starts with the Red Sox in 2014.