PHOENIX -- Emilio Bonifacio exited Tuesday night's game after one inning, but it wasn't because of a left thumb issue.
The Marlins center fielder was lifted for pinch-hitter Gorkys Hernandez in the second inning due to right knee pain. Bonifacio is listed as day to day. He'll have an MRI exam on Wednesday morning to determine the severity of the ailment.
"It started bothering him pretty bad," manager Ozzie Guillen said. "That's the reason we took him out of the game. I don't know if he did it when he threw the ball in the first inning.
He came out of the game. They told me Boni is in the trainer's room. I went to check him out and he couldn't play."
Injuries have plagued the speedster all season. Twice he spent time on the disabled list with a sprained left thumb. He was activated on Sunday when the team was at Colorado.
On Tuesday night, Bonifacio led off against the D-backs, and he struck out looking in his only at-bat. He played center field in Arizona's five-run first inning. He caught two fly balls and didn't have to run a great distance for either one.
When his spot in the order came up in the second inning, Hernandez came in to pinch-hit.
The Marlins play a doubleheader at Arizona on Wednesday, and the team is off on Thursday, before facing the Dodgers on Friday in Los Angeles.
Bonifacio is batting .258 on the season, and he ranks among the National League leaders with 30 stolen bases.