Alexander Zverev, the former world number two, won't be subject to punishment after a probe into domestic abuse allegations.
According to the ATP investigation, there was "insufficient evidence" to support the charges made by Olya Sharypova, the German's ex-girlfriend.
She accused Zverev of using physical and emotional abuse during their relationship in 2020, but he denied these accusations.
If new information becomes available, the ATP decision might need to be "re-evaluated."
The governing body of men's professional tennis claimed it hired the Lake Forest Group, a private investigation firm, to look into the claims.
The organisation that oversees men's professional tennis claimed it hired the Lake Forest Group, a private investigation firm, to look into the claims.
Additionally, it spoke with 24 other persons, including players, family members, and friends, and conducted "extensive interviews with both Sharypova and Zverev."
Text messages, audio recordings, and images were examined during the 15-month probe.
"Based on a lack of reliable evidence and eyewitness reports, in addition to conflicting statements by Sharypova, Zverev, and other interviewees, the investigation was unable to substantiate the allegations of abuse," the ATP said.
Two-time Tour Finals champion Zverev rose to the second spot in June of last year before sustaining a major ankle injury during a match against Rafael Nadal at the French Open.
This month saw his comeback to action.
After Sharypova brought forward additional allegations of abuse in 2021, Zverev filed a lawsuit against her and an internet publisher.
Additionally, he supported the ATP's introduction of a domestic violence policy.