That litany of health issues Novak Djokovic dealt with earlier in the week—hip, ankle, stomach and more—seemed a tad humorous to Andy Roddick.

So Roddick joked about it, first by saying in an on-court interview it sounded as though Djokovic had “about 16 injuries,” then by wondering aloud whether the problems might not also include bird flu, anthrax, SARS and a common cold.

Djokovic heard about the comments. He wasn’t amused.

So when he finished beating Roddick 6-2, 6-3, 3-6, 7-6 (5) in the U.S. Open quarterfinals Thursday night, Djokovic said so.

“That’s not nice, anyhow, to say in front of this crowd that I have 16 injuries and that I’m faking,” Djokovic said after match, eliciting hearty boos from spectators in Arthur Ashe Stadium.

“They’re already against me,” he said of the fans, “because they think I’m faking everything.”READ MORE