Andy Roddick says he did not walk out of a Beijing press conference. (Ng Han Guan / AP)

Roddick called a 4-6, 5-7 first-round loss to Kevin Anderson of South Africa in the China Open in Beijing “unacceptable,” then left a press conference after a question he also deemed unacceptable.

“If I break twice and don't win a set that says my serve isn't on,” Roddick said. “It's unacceptable.”

That, and his place in the world rankings, triggered a question about a possible 29.

“I think you should retire,” Roddick said after a measured silence.

With that, he got up and left. Later, he denied that he’d walked out on the presser, tweeting: “About this whole 'walked out of a press conference' thing. Moderator announced that it was last question before my retirement response. ... Definitely did not get up in the middle and ‘walk out of interview’ contrary to headline on Answered last question and left”

At any rate, his response and departure were greeted with applause.