SAN FRANCISCO -- The Giants' outfield is hobbling with 13 games remaining. Right fielder Hunter Pence (lower back spasms) left Friday's 3-2 loss to the D-backs and Gorkys Hernandez (left wrist sprain) was limited to defense only.
Both are considered day to day.
Pence exited after diving in the seventh inning in an attempt to rob Daniel Descalso of a hit. Pence extended fully and later said he felt it "jam up."
"It just was hyperextended," Pence said. "I hit the ground and it immediately just locked up. Everything else is great. ... [I'll] try to loosen it up. Once I can get it moving, I'll be back in there. Shouldn't be too long."
Pence didn't return to right field for the eighth. Manager Bruce Bochy summoned Hernandez, whom he indicated before the game was unavailable. Afterward, he clarified that Hernandez is limited to defense and pinch-running.
Bochy said there's a "good chance" Hernandez might be able to swing the bat Saturday.
Asked why he used Hernandez instead of an outfielder at full strength, Bochy said: "I wanted to keep a couple guys on the bench -- keep my options open."
Hernandez knew his wrist wouldn't keep him out too long.
"I'm ready to play. Whenever I get the opportunity to be in the lineup, I'll be there," Hernandez said. "I want to help the team win games. If tomorrow he needs me, I'll be there."
Even if Pence misses defensively at times, Bochy is impressed by his approach.
"He plays his heart out every game," Bochy said. "He leaves everything out there on the field, which he did today. He had to leave the game. It makes it tough."
Hernandez is two or three weeks removed from his wrist sprain, and his recent slump (3-for-34) might be tied to his symptoms. But overall, he's revitalized his season average after a slow start to 2017.
"With his struggles early in the season, I know there was a question, 'Well, why is he here?'" Bochy said. "When you get to see him play more defensively, you see how gifted this guy is out there. I'll put him with some of the top center fielders. That's how good he is out there."

Hernandez is the Giants' top defensive outfielder on Statcast™'s new Outs Above Average metric. He's saved +5 outs over an average Major League outfielder -- and is tied with five other players for 19th overall in MLB.
• Bochy didn't offer up any new details on how the Giants will honor Ryan Vogelsong before Sunday's game. The organization announced he will "take the mound" and retire as a Giant.
The Giants' skipper indicated Wednesday that Vogelsong won't be on the lineup card to face a batter.
"That's not really my department," Bochy said. "I'm letting them figure it out. It may be a surprise."
Then he joked: "Maybe a parachute, we don't know."