There was a bit of uncertainty as to whether or not Jason Day would even tee off in the third round of the U.S. Open. And, if he did, there was uncertainty about whether he'd be able to complete his round.
Day, you see, has been battling a case of vertigo. In a scary scene on the final hole Friday, a bout of vertigo hit Day out of nowhere and he dropped to the ground.
Day completed the hole then went to receive medical treatment.
In a story that's almost to incredible to believe, Day -- very clearly not close to 100 percent health-wise -- was playing like a champion in the third round.
Check out this remarkable tee shot and putt he hit at the par-3 17th hole at Chambers Bay, which -- at the time -- pulled him within one shot of the lead:
Immediately after that, Day birdied the 18th hole to shoot a 2-under 68 and take the clubhouse lead.
He respectfully declined a television interview request following the round to... get back to not feeling well.
What an effort by Day. For Sunday, the Aussie has positioned himself for a chance at his first major win.