Germany's Philipp Kohlschreiber retired in the fifth set of his Court 18 clash against Croatian Ivan Dodig at Wimbledon today.
The 29-year-old 16th seed had not appeared to be carrying an injury in the first four sets or the early stages of the decider.
But he had been clearly unhappy about several line calls and at 4-6 6-7 (6-8) 7-6 (7-3) 6-3 2-1 behind he told umpire Mohamed El Jennati he would not be continuing.
Speaking to the press after the match, Kohlschreiber put his retirement down to tiredness, saying he had been suffering from flu.
"I was the last three days almost entire time in the bed," he said.
"I had a flu. I feel pretty bad. I felt like my body is really responding bad at the end and I was no energy left in my body.
Asked about the timing of his withdrawal, Kohlschreiber admitted it wasn't ideal.
"Maybe was bad timing, but I was pretty - it's pretty hard to speak about because, you know, it's my best Grand Slam I played last year.
"I'm for sure the one who is really, whatever you want to call it, angry or sad about the situation. It's very bad timing for sure. But it's nothing you can do about it."
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