Los Angeles Dodgers manager Dave Roberts said Friday umpires have been collecting baseballs from all pitchers early in the 2021 season, so he's curious why Dodgers starter Trevor Bauer is the only one who's been mentioned publicly.

"I hope that our player has not been singled out," Roberts told reporters. "... That's the only name I've heard floated."

Ken Rosenthal of The Athletic reported Thursday multiple baseballs from Bauer's most recent start, a 4-3 loss to the Oakland Athletics on Wednesday, were collected and MLB sources said they had "visible markings and were sticky." They were sent to the league office for further inspection.