It was a fight between the Americans Francis Tiago and Mitchell Krueger. Tiago was going to give, suddenly distracted, hearing the groans coming from somewhere nearby.
Perplexed, the players stopped playing. Kruger launched the tennis ball in the direction from which it seems came the sound. And Tiavo later shouted: "he can Not be so good!".
The commentator of the online broadcast is first assumed that on the phone someone from the audience in the stands is an "adult movie", but a few jokes later admitted that the sound is live and coming from houses nearby.
Occupying in the world ranking ATP 87th Francis Tiago eventually won the meet with a score of 6:3, 6:2.