UNIVERSITY PLACE, Wash. – Australian Jason Day has teed off in the third round of the U.S. Open about 24 hours after collapsing at the end of his second round due to vertigo.

Day arrived on the practice range at Chambers Bay around 12:55 p.m. local time and proceeded to hit balls for 40 minutes. Day holed his second practice chip from about 25 yards and went through every club in his bag before taking a shuttle to the first tee.

Day’s status was in question after he was overcome by dizziness and collapsed on his final hole at the U.S. Open on Friday. Day was walking down the ninth hole — his last of the day — and fell over to his left.

Day, who has dealt with vertigo in the past, was treated by doctors on Friday evening.

HOGAN AT MERION: Ben Hogan was the reigning U.S. Open champion when his car collided with a bus in West Texas in 1949, an accident so horrific that it nearly killed him and doctors feared he would never walk again.

Hogan returned to golf a year later and played the U.S. Open at Merion in 1950. He had to soak his legs for an hour each night just to keep playing, and while he was only two shots behind Dutch Harrison going into the 36-hole final day, there were questions whether they could hold up over two rounds.

With Hogan needing a par on the 72nd hole to get into a playoff, his legs were so weakened that he hit 1-iron into the 18th. A plaque at Merion commemorates the shot Hogan hit that led to par, and the photo of his swing is among the most famous in golf. And he won the playoff. Of his four U.S. Open titles, that one meant the most to Hogan “because it proved I could still win.”

That belonged to Spieth, the phenom from Texas who impressed so many by not only winning the Masters but the grace and composure he showed while doing it. He spoke after that win about bringing a present home to his special needs sister, and it was clear that meant almost as much to him as winning his first green jacket.

He’s now halfway to history, yet still barely old enough to drink. The last player who did things like Spieth was named Tiger Woods, which seems so long ago.

Now he’s the youngest since Bobby Jones nearly a century ago to win back-to-back major championships. Spieth has a chance to do what even Woods couldn’t and win all four of golf’s major tournaments in one year.

Watching him Sunday on the crunchy greens at Chambers Bay, it was hard not to get the sense that he’s only just begun.