SAN FRANCISCO (AP) — Billy Hamilton may have reinjured his right shoulder Monday night, putting his status for the rest of the season in question.
The center fielder left the Reds' 5-3 loss to the Giants in the fifth inning with shoulder pain. Hamilton just came off the DL on Sept. 8 after missing 21 games with a right shoulder injury.
He said he felt pain after making two long throws from the outfield.
VIDEO: Watch Hamilton run down a drive over his head.
"We'll have to wait and see what the doctor says," Reds manager Bryan Price said.
Jay Bruce homered, Ramon Cabrera had four hits and Joey Votto kept his on-base streak alive in the Reds' loss.
Votto had a bases-loaded walk and has reached base safely in 33 consecutive games, the third-longest active streak in the majors.
Reds rookie starter Keyvius Sampson (2-5) lasted just three innings and allowed four runs on five hits. The Reds' rookie is winless since Aug. 13.
Matt Duffy doubled twice and drove in two runs for the Giants. Brandon Belt tripled and drove in two runs and ex-Red Marlon Byrd added an RBI double to help San Francisco win its fourth straight at AT&T Park.
The defending World Series champs remained 7 ½ games behind the Los Angeles Dodgers in the NL West with 18 games remaining — including four against the Dodgers.
George Kontos (3-2) retired four batters for the win after Tim Hudson failed in his bid for the 222nd victory of his career.
Duffy hit a two-run double off Sampson in the first inning then doubled and scored on Belt's two-out triple in the third.
Byrd followed with the Giants fourth extra base hit to extend the lead to 4-0.
Hudson wasn't able to stick around long enough for the win. He gave up one run and three hits in 4 1-3 innings but walked three and left with the bases loaded in the fifth.
Bruce hit his 21st home run in the seventh off reliever Josh Osich to pull Cincinnati to 4-3.
The Giants added an insurance run in the eighth on Belt's sacrifice fly.
Santiago Casilla pitched the ninth for his 33rd save.
UP NEXT
Reds: LHP John Lamb (1-3) earned his first major league victory in his previous start and will try to make it two in a row when he faces San Francisco for the first time.
Giants: RHP Chris Heston (11-10) is winless in his previous seven starts and has a 5.08 ERA during that span.
