The former girlfriend, Olga Sharypova, first made the accusations last year. She provided a new, detailed account in a Slate.com story in August.
"I've always said that the allegations and everything that has been said is untrue," Zverev said at a news conference in late August before the start of the U.S. Open.
He said then that he would support the introduction of a domestic violence policy by the ATP.
The tour also said Monday it has received what it called an "independent safeguarding report," saying it is "a key element of the ATP's overall safeguarding review to ensure all adults and minors involved in professional tennis are safe and protected from abuse."
The ATP said it will "evaluate the report's recommendations to identify immediate next steps ... relating to all matters of abuse, including domestic violence."
- AP