The red, white and blue bunting was put away, and the pregame hoopla was limited to some Irish jigs on the first of several ethnic heritage nights at AT&T Park.
Taking a break from celebrating their 2012 title, the Giants got down to baseball for baseball's sake, manager Bruce Bochy saying of the weekend championship pageantry, "Hey, it's over now. ... It's time to go to work."
Hunter Pence wasted no time, smacking a three-run homer in the first inning, which sparked a 4-2 victory over the Rockies on Monday night.
Pence hit seven homers in 59 games with the Giants last year. This season, he has three in seven games, a sign that his value could go well beyond leading postseason pep rallies.
"He's got some of the best power I've ever seen," said Buster Posey, who drove in the Giants' other run for his first RBI of the season. "I get to hit with him in BP, and I'm trying to make sure I hit before him so I don't follow his moon shots."
Madison Bumgarner got the win, though he was far less sharp than in his first start, when he tossed eight shutout innings at Dodger Stadium. He threw 101 pitches that night. On Monday, he needed 104 to get through 5 2/3 innings, issuing his first five walks of the season.
The damage off Bumgarner was Carlos Gonzalez's one-hopper into McCovey Cove in the third inning, a solo homer that came moments after Bumgarner picked off Eric Young, and an RBI single by Chris Nelson, which chased the lefty in the sixth.
"Mental lapses," Bumgarner said. "I didn't feel I had the same trust as the first time. Walks were part of not trusting myself. I didn't have a lot of conviction, I guess. Not the whole night, just on some pitches."