The wild moans could be heard as Frances Tiafoe played Mitchell Krueger in the first-round match.

The woman’s moans grew so loud Tiafoe was put off his serve.

Tiafoe (pictured) giggled to himself with Krueger grabbing a ball and smashing it out of the court to where the euphoria was coming from.

Tiafoe then yelled out: “It can’t be that good!”

Commentator Mike Cation thought the noise was coming from a video of a fan’s phone.

“Well, that is the most bizarre situation,” Cation said on the Challenger Tour live stream. “I don’t know how to put this, folks, but somebody’s phone is going off in the stands ... and it was an adult video.”

Cation then realised the noise was coming from a nearby house.  

“No, that’s not a phone, that’s an apartment across the lake,” he said. “Oh my God.”

Tiafoe went on to win the match in straight sets 6-3 6-2.