Caroline Wozniacki has launched a scathing attack on organisers of the ongoing U.S Open Grand Slam tournament.

The Dane is accusing the officials of bias especially as it concerns the treatment they are giving Russian tennis star Maria Sharapova.

Wozniacki is furious at what she terms as favouritism for the five-time major winner who is returning from a 15-month drug ban.

After her defeat to Ekaterina Makarova, Wozniacki branded her own scheduling as ‘unacceptable’ – particularly in light of the 30-year-old Russian’s favourable placing on the main show court.

"I think putting out a schedule where the No. 5 is playing on Court 5, fifth match on after 11pm – I think that’s unacceptable," she fumed

"You know, and when you look on Centre Court – I understand completely the business side of things – but someone who comes back from a drugs sentence – performance enhancing drugs – and all of a sudden gets to play every single match on Centre Court, I think that’s a questionable thing to do.

"I think it doesn’t set a good example and I think someone who has fought their way back from injury and is five in the world deserves to play on a bigger court than Court No. 5.

"Finally they moved us to Court 17, which is a really nice court actually and we had great atmosphere out there but I think they should probably look into what they need to do in the future."

Sharapova overcame Simona Halep and Timea Babos in her opening two matches and will face America’s Sofia Kenin in the third round.