An investigation into claims world number four Alexander Zverev was violent towards a former girlfriend has been opened by tennis chiefs.
The men's ATP Tour said the German welcomed the investigation and that he denied the allegations.
"The allegations raised against Alexander Zverev are serious and we have a responsibility to address them," said Massimo Calvelli, ATP CEO.
Separately, a safeguarding review of the ATP has been completed.
Last month Olympic champion Zverev, 24, said he was taking legal action over allegations he abused his former girlfriend, Olya Sharypova, during the Shanghai Masters in October 2019.