Serena Williams and Jelena Jankovic get into a dispute during the Family Circle Cup final over whether Jankovic was trying to serve before Serena was ready. SI.com reports that at 40-15 in the first game of the second set, Serena went into a crouch to return serve, but put her racket up to stop Jankovic during the Serbian’s service motion.

“You gotta wait,” Serena then said.

“How long do I have to wait?,” Jankovic replied.

“Until I’m ready. I don’t play slow,” Serena said.

“But you go like this,” said Jankovic, who then imitated her crouching.

“Honestly, you got a problem? I’m not the one,” said Serena.

Jankovic later said she doesn’t get up to the line to serve quickly and that she shouldn’t have to wait for the returner to be ready. Williams won 12 of the 14 games and won the match, 3-6, 6-0, 6-2.

Serena added that after that she relaxed and told herself to “chill out.”