New York (AP)— Andy Roddick found it infuriating that a lineswoman who called him for a foot fault was wrong about which of his shoes touched the line.

The 2003 U.S. Open champion had much bigger problems Wednesday night at Flushing Meadows, though, and bowed out in the second round with a 3-6, 7-5, 6-3, 7-6 (4) loss to 44th-ranked Janko Tipsarevic of Serbia, whose go-for-broke style paid off with 66 winners.

“He played very high-risk and executed for four sets,” said the ninth-seeded Roddick, whose exit leaves Roger Federer as the only past champion in the men’s field. “I kept telling myself, ‘You know, this has to have an expiration date on it.’ Unfortunately, I needed another set for that.”

Already trailing 5-2 in the third, Roddick wound up in an argument over a foot-fault call on a first serve. He turned to the official and asked, “What foot?”

When she told him it was his right foot, he replied, “That’s impossible.” Roddick then turned to chair umpire Enric Molina and, pointing first to his right foot, then his left, asked, “Has THIS foot gone in front of THAT foot ever in my career?”

Molina replied: “Not in my matches.”

A TV replay showed Roddick did commit a foot fault—but with his left toes. And what really bothered Roddick, he said afterward, was that the official would not acknowledge that she was mistaken when she blamed his right foot for the ruling.

“I was just stupefied,” he said.

Indeed, asked later what might have happened if the lineswoman said the call was made because his left sneaker was on the baseline, he replied: “There would have been no discussion.”

“Not once in my entire career does my right foot go in front of my left foot,” Roddick said. “Not once. Ever.”

He missed his second serve for a double-fault, then continued to harangue the official, at one point jokingly making a reference to “1-800-Rent-a-Ref.”

“In hindsight, did I let it go too far?” Roddick said at his news conference, repeating a reporter’s question. “Probably.”