Nick Kyrgios went off on chair umpire Mohamed Lahyani during the third set of his 6-0, 6-2, 7-6(6) first-round Wimbledon victory over Diego Schwartzman.

The point in question came when Schwartzman hit a shot near Kyrgios’ baseline that was called long. Kyrgios’ mis-hit the ensuing shot into the stands, so when Schwartzman challenged and his ball was shown in, Lahyani awarded the point to the Argentine instead of calling for it to be replayed.

Kyrgios clearly disagreed, as he threatened to stop playing until the supervisor was called, gave Lahyani a lesson on rules of the game, and then asked Lahyani if he was actually being serious.

The Aussie was soon overheard muttering the phrase “dirty scum,” but he insisted it was directed at himself.

“I wasn’t referring to the ref at all there,” Kyrgios assured. “Yeah, I mean, it was towards myself.”

Asked why he would direct it at himself, the 2014 quarterfinalist said, “Cause, I can.”