SAN FRANCISCO -- Normally, the catcher who drives in runs for the San Francisco Giants is Buster Posey. On Saturday, Posey was over at first base and Andrew Susac was the hitting star.

Susac hit a bases-clearing double with one out in the bottom of the seventh inning and San Francisco rallied for a 7-5 win over the Colorado Rockies.

"We're feeling good," Susac said. "Every win at this point is big. You don't want to get into a big slump. You've got to keep it pretty even-keeled, but wins are always big. That is a good comeback win for us."

The Giants won for the first time in five home meetings with the Rockies when Susac hit a 1-1 pitch from Rafael Betancourt (2-3) down the left-field line, scoring Posey, second baseman Joe Panik and third baseman Chris Duffy. Susac's hit came after the Rockies elected to intentionally walk Posey.

"I'm pretty confident right now, to be honest with you," Susac said. "(The walk) didn't really change my mindset. ... I stayed with the same approach I've been going with, not trying to do too much. I got a good pitch right over the plate there and luckily got it past (Rockies third baseman Nolan) Arenado, because nothing really gets by that guy."

San Francisco won on a day when right-hander Tim Lincecum departed in the second inning after taking a line drive off his right forearm on a grounder by Rockies second baseman D.J. LeMahieu.

"It was probably mid-forearm and it got me and tightened up on me immediately," Lincecum said. "Right now it feels like a bruise, but just a little bit stiffer than usual, and we'll go about treating it and progressing it day by day."

Lincecum was coming off his worst outing -- five runs on seven hits in 1 1/3 innings at Los Angeles. In his past two starts, he has pitched just three innings, allowing eight runs and 11 hits.

"These are things we're going to talk about and we have to the next couple of days," Giants manager Bruce Bochy said. "I think it's fair to say Timmy was off today too with his command, his stuff. He might need a break; he's going to get it with this contusion. But he's like a lot of pitchers: Sometimes you need to back them off, skip a start. So we're going to talk about it. But Timmy, his last couple of starts, just has not been on top of his game. His pitches aren't as crisp and I know he's battling out there."

When asked if the return of Matt Cain and Jake Peavy might result in a different role, Lincecum replied, "That's not up to me. I've got to find a way to be ready whenever that happens; and, if they make that call, they make that call. You've got to deal with it then."

On Saturday, four relievers combined to go 7 2/3 innings as George Kontos (2-0) pitched a scoreless seventh for the win and Santiago Casilla worked around a walk in the ninth for his 20th save.

Duffy had three hits, falling a triple shy of the cycle. He hit a solo home run in the fifth that cut San Francisco's deficit to 5-4.

Posey also drove in two runs as the Giants rallied from an early 3-0 deficit.

Colorado scored three in the first on a single by shortstop Troy Tulowitzi, a double by Arenado and a single by first baseman Wilin Rosario.

San Francisco scored three in the third, capitalizing on a fielding error by Rosario on a force play. The Giants had the bases loaded after Panik reached on the miscue and scored their first run on Duffy's groundout before Posey doubled to left-center field.

Colorado regained the lead with two runs in the fourth. Pitcher Chris Rusin's hit deflected off Panik's glove and into right field, allowing catcher Michael McKenry to score from second base. Center fielder Charlie Blackmon then lifted a sacrifice fly for a 5-3 lead.

Rusin allowed five runs (two earned) and 10 hits in 6 1/3 innings. He struck out four.

"That's who I am. I'm not a power pitcher and I'm not going to strike a lot of people out," Rusin said. "I pitch to weak contact and try to get ground balls."

Despite the loss, the Rockies are 7-4 vs. the Giants this season and have won eight of their last 12 games in San Francisco.

"It was a good game," Rockies manager Walt Weiss said. "We battled. (Yusmerio) Petit came in and settled us down a little bit. We were rolling early, but they got the big hit. It's typical how it goes. Whoever's behind usually chases the other team down and it comes down to the last inning. And it did again today. It was a good game, but we came up on the short end."

NOTES: Rockies 3B Nolan Arenado extended his hitting streak to 14 while CF Charlie Blackmon and SS Troy Tulowitzki each have 11-game streaks. Those are the three longest active hitting streaks in the National League. ... Tulowitzki has a .383 batting average in June, tops in the NL. Giants 2B Joe Panik is batting .348, good for sixth place. ... The Rockies are 7-4 against the Giants this season, including a 4-1 mark in San Francisco. ... Since a 7-2 start, which was the franchise's best, the Rockies are 26-39. ... Giants pitchers have allowed 21 runs on 37 hits in 27 innings (7.00 ERA) over the last three games. ... Before Saturday, RHP Tim Lincecum was 0-3 with a 5.59 ERA (23 runs in 37 innings) in his last six starts against the Rockies, with five of those starts coming at AT&T Park. He last beat the Rockies on Sept. 18, 2012.