Jason Day’s playing partners and mates have rallied around him after he collapsed at the US Open.
Day is resting in his motorhome near the course after falling down playing the steep ninth hole, the last of his second round.
His agent Bud Martin said only that Day had been “feeling dizzy near the end of his round”.
“Jason is being treated on site at Chambers Bay,” Martin said.
“We will provide more information later today after getting through the medical evaluation process.
“Jason wants to express his appreciation for all the good wishes from so many fans and friends.”
Chief among the well-wishers was former world No.1 and close mate Tiger Woods, who was touchingly far more concerned with Day than his own early departure from the tournament.
“He's one of my really close friends. I'd like to get out of here and see if he's OK,” Woods said.
“I know he didn't play in Dallas this year because of vertigo.
“I played with him at Memorial and we talked about it in depth, and did a blood panel and all that stuff.’
“I hope he's OK.”
Playing partners Jordan Spieth and Justin Rose were visibly concerned for the Queenslander, both trying to shield Day from prying eyes during the incident.
Both said Day had shown no signs of impairment during his round.
“It wasn't mentioned by him earlier in the round to me,” Spieth said.
“He may have mentioned it to (his caddie) Colin (Swatton), but I was walking with him, the next thing I know I turned around and I think he got dizzy and slipped and fell.”
Rose said Day had been “100 per cent” before he collapsed just metres before his round finished.
“No, he was good. He was in good shape,” Rose said.
“His game was looking good. His focus looked good. He made a great up and down on seven, birdied eight (and) seemed chirpy, buoyant all day.
“That was out of the blue, for sure.”
Rose, who beat Day to the 2013 US Open crown at Merion, said the Aussie didn’t say much in the scorer’s hut before he was whisked away for medical treatment.
“He didn't say much, actually. I (asked if it had been) just the stuff (he’d) been struggling with recently and he said, `Yeah, same stuff.’.
Former world No.1 David Duval added to the chorus of support for Day.
“Vertigo is no joke. Wish Jason Day the best,” the American wrote on Twitter.