A visibly struggling Jason Day overcame the lingering effects of vertigo to charge up the field and tie for the lead at the third round of the U.S. Open.

The Australian collapsed on the ninth hole of the Chambers Bay Golf Course Friday and looked to be struggling with dizziness on several occasions Saturday.

But five birdies on the back nine canceled out three earlier bogies to ensure a two-under-par round of 68 leaves Day tied atop the leaderboard alongside Dustin Johnson, Branden Grace and Jordan Spieth.

Day even fumbled the ball as he tried to place it on the green for his final putt of the day and looked like he was leaning on caddy Colin Swatton to remain upright.

“I felt nauseous all day” said Day afterwards in comments carried by the tournament website.

“Last year, I (withdrew) after I had vertigo and this one was worse. I think the goal was just to go through today and see how it goes,” he added before leaving to receive medical attention and rest ahead of Sunday’s final round.

Source: http://edition.cnn.com/2015/06/21/golf/u-s-open-2015-day-vertigo/index.html