Caroline Wozniacki has described the schedule of Maria Sharapova's matches on the main court at the US Open as "questionable".
Sharapova has been in red hot form this week after she made her return to a Grand Slam after a 15-month doping ban.
The Russian was handed a wildcard for the final slam of the year at Flushing Meadows and she has won both her matches so far.
Both contests have taken place on the Arthur Ashe Stadium, with Wozniacki claiming that sets a bad example.
The Danish fifth seed was knocked out of the tournament by Ekaterina Makarova on Wednesday, but her game was moved from court five to 17.
Speaking after her defeat, Wozniacki insists the scheduling of Sharapova's matches have caused problems.
She told Danish newspaper Ekstra Bladet: "I think putting out a schedule where the number five in the world is on court five, fifth match on, I feel at 11pm, I think that's unacceptable.
"When you look on centre court [Ashe], I understand completely the business side of things and everything, but someone who comes back from a drugs sentence and, you know, performance-enhancing drugs, and all of a sudden gets to play every single match on centre court, I believe is a questionable thing to do.
"I think it doesn't set a good example."