PITTSBURGH — Freddy Sanchez's rapid ascent from role player to clutch star has been so impressive he will have a bobblehead doll.

Sanchez's RBI double in the eighth inning gave Pittsburgh the lead and the Pirates went on to a 3-1 victory over Colorado on Monday night, the Rockies' eighth straight loss.

"We've talked about this guy a lot, and I said weeks ago that I have run out of words to describe how good of an offensive player this guy is," Pirates manager Jim Tracy said. "He's just fantastic."

Sanchez, the league's leading hitter, raised his average from .360 to .363 with two hits — the second of which was a double into the right field corner off Byung-Hyun Kim (5-6) that came after Jack Wilson doubled to left with one out in the eighth.

Sanchez and Wilson both had two hits for the Pirates, who have won three of four since the All-Star break.

"I was just looking for a good pitch to hit out over the plate," said Sanchez, who began the season as a backup to Joe Randa at third but made the All-Star team. "That's what you play for, to hit in situations like that to give your team a chance to win."

During the game, the Pirates announced that Sept. 30 will be Freddy Sanchez All-Star Bobblehead Night.

Sanchez downplayed that meant he has arrived, saying he hopes the team — which had the major league's worst record at the All-Star break — will arrive instead.

"Hopefully there's no more, 'Well, we're still learning from this,"' Sanchez said. "It's time to execute and get the job done."

The Pirates added another run in the eighth inning when Sanchez scored on a bases-loaded walk to Jose Bautista. Rookie Matt Capps worked the ninth for his first career save.

"It feels pretty good," said Capps, who leads all rookies with 50 appearances. "It was fun, a good experience."

The go-ahead runs were scored a half-inning after the Rockies appeared to be on the verge of breaking a 1-1 tie that had endured since the third.

Garrett Atkins hit a double to the gap in right-center — his third hit of the game — off John Grabow (2-1) with Todd Helton on first. But center fielder Batista made a strong relay throw to second baseman Jose Castillo, who quickly got the ball home to Ronny Paulino, who blocked enough of the plate to barely tag out Helton in time.

"I don't know if there's another player in the game who can make a throw from that distance and that is that accurate," Tracy said of Castillo. "That play was executed to perfection. It took a perfect throw from the outfielder and a perfect throw from the cutoff man."

Helton was the only the second runner on either team to get as far as third base after the third inning, as Kim and Pittsburgh starter Kip Wells combined for six 1-2-3 innings.

Wells, who missed almost three months at the start of the season after surgery in March to repair a blocked artery in his right arm, had allowed 23 earned runs in 16X\c innings in four starts this season — all losses.

He enjoyed easily his best start of the season, allowing one run and seven hits in seven innings, walking two and striking out four.