Sinner fires trainer, physio amid doping furore

NEW YORK : World number one Jannik Sinner announced he had fired his trainer and physiotherapist after he escaped a doping ban despite failing two drug tests in March.

The Italian tested positive for the steroid clostebol, which can be used to build muscle mass, after his physio Giacomo Naldi applied an over-the-counter spray to a cut on his own hand before carrying out treatments on Sinner. The spray was given to Naldi by trainer Umberto Ferrara.

The Australian Open champion was cleared of fault or negligence by a tribunal last week, accepting Sinner's explanation that he had inadvertently been contaminated with the substance by Naldi, the International Tennis Integrity Agency (ITIA) said.

The positive doping tests came to light on Tuesday, a day after the Italian won his fifth title of the year at the Cincinnati Open.

"They (Naldi and Ferrara) have been a huge part for my career," Sinner said in a news conference at the U.S. Open on Friday.

"We made an incredible job, bringing a lot of success and then having a great team behind me.

"Now, because of these mistakes, I'm not feeling that confident to continue with them. I was struggling a lot in the last months. I was waiting for the result. The only thing I need right now is some clean air."

Sinner's case has created a storm considering other players who failed drugs tests usually get suspended during the course of the investigation.

Sinner has repeatedly maintained his innocence and said he was able to keep playing because his team quickly identified the source of the contamination.

"The reason why I could have played was because we knew where the substance was in and how it came into my body," he said. "This is very important, making this process, to letting them know, and