Alexander Zverev asked for a spectator who heckled him over domestic abuse allegations to be kicked out of his Munich Open quarter-final.
The German number one seed was serving at 5-5 in the second set against Dutchman Tallon Griekspoor when the fan shouted: "Let's go, you wifebeater."
Zverev spoke to chair umpire Fergus Murphy and could be heard saying "Fergus, please kick him out".
It is not clear if the spectator was ejected from the stadium.
In January, Zverev was heckled by a spectator during the Australian Open men's singles trophy ceremony.