It's unclear how long he will be out. He was not in the lineup for Tuesday's game against the Marlins, though the team said his status would be updated Tuesday.
Baez was hurt during the seventh inning when Miami's Brian Anderson doubled into the left-field corner. Baez wasn't involved in the play but ended up in the shortstop position and squatted in apparent pain.
After a brief visit from Cubs trainer P.J. Mainville, Baez walked off the field under his own power but with a slight limp. He was replaced at second base byTommy La Stella.
Maddon said Baez was lifted because of the lopsided score and he doesn't believe the injury is a concern.The Cubs led 9-2 at the time of Baez's injury.
"When I went out there, he didn't say specifically [what was wrong]," Cubs manager Joe Maddon said. "He just said, 'It's tight.' There was no sense to leave him in the game right there."
Baez hit a three-run homer in the third inning, his third straight game with a home run. He leads Chicago with 10 home runs, 32 RBIs and a .650 slugging percentage.
With Monday's home run, Baez became the first Cubs player with at least 10 homers and 32 RBIs during the first 32 games of a season since Sammy Sosa in 2001.