LONDON, England — Novak Djokovic is a seven-time winner of Wimbledon and cruised to victory on Monday, defeating 15th-seeded Holger Rune, 6-3, 6-4, 6-2.

So Djokovic, the No. 2 seed, has reached the quarterfinals … but he wasn’t too happy after the match.

The Serbian star gave the crowd a piece of his mind afterward, apparently reacting to what he thought were boos during the match. Rune’s supporters at various tournaments often will stretch out his last name, saying “Ruuuuuune!” — which sounds rather similar to “boooooo!” — and that happened again Monday.

Djokovic wasn’t buying the “Ruuuune” explanation, the BBC reports.

“I know they were cheering for Rune but that’s an excuse to also boo,” Djokovic said during an interview on the court following the match, according to the Daily Mail. “I have been on the tour for more than 20 years. I know all the tricks.

“I focus on the respectful people that pay for the ticket and love tennis and appreciate the players. I played in much more hostile environments, trust me – you guys can’t touch me.”

The Guardian reports that Rune is used to the chants and acknowledge that it could be mistaken for boos.

“Obviously he’s played so many matches since he played me last time,” Rune said. “If he didn’t remember, it could probably sound different for him. I don’t think it played a massive part in the match.”

Djokovic holds the record with 24 wins in major tournaments.

(The Associated Press contributed to this story.)