Defending champion Rafael Nadal sensationally collapsed in agony in the middle of a US Open news conference on Sunday, just two hours after securing his fourth round place.
The 25-year-old world number two was talking to the Spanish media following his third round win over close friend David Nalbandian when he grimaced in pain, screwed up his eyes and slumped in the back of his chair, feeling his right leg.
Nadal, a winner of 10 Grand Slam titles, slipped to the floor while tournament medical staff were summoned and scores of reporters and camera crews ushered out of the interview room deep inside the Arthur Ashe Stadium.
After 15 minutes of treatment, Nadal was back on his feet, insisting that the problem was merely cramping.
"It was just cramping in the right leg, in the front and in the back. It was very painful, that's all," said Nadal, who resumed his news conference standing instead of sitting.
A smiling Nadal insisted the incident will not affect his preparations for his fourth round match against Luxembourg's Gilles Muller, scheduled for Tuesday.
"I will train normally on Monday. It was just a normal cramp that could have happened anywhere, but it happened in the press room. Anywhere else, nobody would have noticed."
During his 7-6 (7/5), 6-1, 7-5 win over Nalbandian, played out over 2hr 39mins in heavy, 84 degree-heat (29 degrees centigrade) Nadal had also needed treatment on his blistered right foot.
The Spanish star has been plagued by injuries in recent years.
He suffered a serious left foot injury at Wimbledon this year while tendinitis in both his knees saw him suffer a lengthy absence from the tour in 2009.
Muller defeated Russia's Igor Kunitsyn 6-1, 6-4, 6-4, for a place in the quarter-finals.
Muller famously defeated Nadal at Wimbledon in 2005 before the Spaniard got his All England Club revenge this year.