Oliver is 3-0 in his last four starts, allowing three earned runs or fewer each time—including a 9-8 win at Milwaukee Saturday during which the left-hander gave up three earned runs and five hits in seven innings.
Oliver is 4-0 with a 3.27 ERA at home, and 1-1 with a 3.00 ERA in two starts against the Giants this season.
Oliver was supposed to be opposing Giants ace Jason Schmidt, but Schmidt was pushed back a day and is scheduled to pitch at Arizona on Friday.
Rookie Brian Powell will start for San Francisco after being recalled from Triple-A Fresno. The 30-year-old right-hander takes the roster spot of Kirk Rueter, who was placed on the 15-day disabled list with a strained left shoulder Wednesday.
Powell was 7-7 with a 3.95 ERA in 22 appearances, including 14 starts in the minors.
The Rockies took the opener 11-7 Wednesday, snapping a three-game losing streak.
The Rockies are a major league-best 32-15 at home.
The Giants, who came in with the NL’s best road mark, had their three-game win streak snapped. It was only the fifth loss in 16 games for the NL West leaders.
Barry Bonds drove in four runs for San Francisco, including a three-run homer, his 27th of the season and 640th of his career. Bonds needs 20 more homers to tie Willie Mays for third on baseball’s career list.
The All-Star left fielder is batting .406 (13-for-32) in his last 10 games with seven homers and 14 RBIs.
STANDINGS: Giants - 1st place, NL West. Rockies - 4th place, 9 1/2 GB, NL West.
GIANTS PROBABLE STARTER: Powell (no record). Powell had 56 strikeouts in 98 innings in the minors.
ROCKIES PROBABLE STARTER: Oliver (6-5, 4.82 ERA). Oliver is 3-3 all-time against San Francisco with a 4.66 ERA in six starts.
OFFENSIVE LEADERS: Giants - Bonds, .316 avg., 27 HRs, 58 RBIs and 62 runs; Ray Durham, Bonds and Grissom, 7 SBs. Rockies - Todd Helton, .343 avg. and 80 runs; Preston Wilson, 20 HRs, 83 RBIs; Wilson and Larry Walker, 6 SBs.
SEASON SERIES: Rockies, 5-4.
STREAKS AND NOTES: Giants - The Giants have an NL-few 38 errrors. … C Benito Santiago, who hadn’t played since coming out of last Friday’s game with a dislocated little finger on his left hand, was back in the lineup Wednesday. … 1B J.T Snow has a homer and six RBIs in seven games since returning from a strained left groin injury. Rockies - The Rockies bullpen has allowed 16 runs in seven innings spanning the last three games. … RHP Shawn Chacon was scheduled to make a rehab start Sunday with Triple-A Colorado Springs. … 1B Helton is batting .478 (11-for-23) during a six-game hitting streak with three homers and eight RBIs.
ROAD/HOME RECORDS: Giants - 28-20 on the road; Rockies - 32-15 at home.
INJURIES: Giants - RHP Rueter (shoulder), 15-day DL; OF Marvin Benard (knee), 15-day DL; RHP Kurt Ainsworth (shoulder), 15-day DL; RHP Robb Nen (shoulder), 15-day DL. Rockies - RHP Chacon (elbow), 15-day DL; OF Chris Richard (hamstring), 60-day DL.