Many would call Barry Zito a good-luck charm for the Giants.
That's because San Francisco has won 15 consecutive games when Zito has pitched, a stretch that dates all the way back to Aug. 7, 2012.
Zito will look to continue that streak when the Giants face the Rockies on Wednesday at AT&T Park in the series finale seeking a sweep.
The left-hander surrendered just three hits in seven innings against the Cardinals on Friday to secure his first win of the season in a tight 1-0 victory. Locked in during the entire contest, Zito retired 15 of 17 batters beginning with the first inning's final out.
"For me, it's about preparation," Zito said after the game. "Knowing the opponent, studying them, knowing their tendencies, knowing their sweet spots and their weak spots."
If the Rockies are hoping to stop Zito's dominance, they'll need a solid performance from left-hander Jeff Francis.
That's exactly what the team got in his first start of the season, with Francis holding the Padres to just one run on five hits in six innings. He also walked one and struck out five.
Mixing speeds throughout the game, Francis didn't go higher than 90 mph on the radar gun, but was able to fool hitters with his slow curveball and changeup.
"I always have confidence in Jeff that he can wiggle his way through stuff if he starts to get some traffic or things start to happen out there," Rockies manager Walt Weiss said. "He's really good at dictating at-bats."
Rockies: Rotation getting in solid innings
Colorado had six quality starts in its first eight games with a 4-2 record after Tuesday night's game against the Giants.
"I think those guys are better than people think, and they're healthy," Weiss said. "That's probably the biggest factor."
• Rockies hitting coach Dante Bichette celebrated the 20-year anniversary Tuesday of when he was on a Rockies expansion team that played the first Major League game in Colorado. The Rockies beat the Montreal Expos, 11-4, before a crowd of 80,227 at Mile High Stadium, a Major League attendance record for a home opener that still stands.
Giants: Affeldt fitting in to role
Making adjustments, Giants right-hander Jeremy Affeldt has found success against left-handed and right-handed batters.
In 2011, Affeldt devastated left-handed batters, holding them to a .144 average. Righties hit .248 off him. He was consistent last year, with lefties batting .236 and righties batting .244.
"I can go away, I can go in, I can go up, I can go down, I can throw curveballs and splits," Affeldt said. "I just have a lot more weapons than when I started. I'm more methodical about how I pitch."
• Francis is 3-6 with a 5.72 ERA in 10 career starts at AT&T Park.
• Giants outfielder Hunter Pence and infielder Pablo Sandoval have combined to drive in 13 of the team's 28 runs this season.
Quinn Roberts is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.