US Open Golf 2015: Leaderboard Scores and Highlights from Saturday - Bleacher Report

Ted S. Warren/Associated Press

On Friday, Jason Day caused a serious scare when he became dizzy and collapsed on the ninth fairway. On Saturday, the 27-year-old earned a share of the 54-hole lead with a two-under 68 in the third round of the 2015 U.S. Open.

Day is tied with Jordan Spieth, Dustin Johnson and Branden Grace atop the leaderboard. According to the PGA Tour, it has been just over four decades since four golfers were tied for the lead after three rounds of the U.S. Open:

You can view the full standings below:

Simply finishing two shots under par in the third round of a major tournament on a course that is giving every golfer a wealth of problems is impressive all by itself. Day's performance was downright inspiring.

His caddy revealed just how much Day's vertigo was affecting him on the course, per Golf Channel's Cara Robinson:

Kelly Tilghman of Golf Channel provided more perspective on the situation:

Even more astounding about Day's round is that his best work came on the back nine, when the effects from his vertigo would seemingly hit him the hardest. He birdied 10, 12, 15, 17 and 18 to close out his round. Fox Sports provided highlights from some of his best shots:

ESPN's Jason Sobel pointed out just how fantastic that stretch was:

Day chalked up his slow start to the medications he received to deal with the vertigo.

"I didn't feel that great coming out early and then felt likeâ€"I felt pretty groggy on the front nine just from the drugs that I had in my system then kind of flushed that out on the back nine," he said after going into the clubhouse, per ESPN.com's Bob Harig.

He certainly overshadowed the other three guys vying for the lead.

Spieth was the only one of the quartet who posted a third-round score that was over par. After an up-and-down front nine, he recovered well on the back nine. The 21-year-old finished with a one-over 71.

ESPN Stats & Info highlighted Spieth's impressive record at major tournaments this year:

Both Grace and Johnson carded even-par 70s Saturday.

Many American golf fans will hope that Sunday proves to be Johnson's breakthrough on the PGA Tour. The 30-year-old showed a lot of promise back in 2009 and 2010 but couldn't quite get over the hump during the ensuing years.

Since making his return to competitive golf in February, though, Johnson has played extremely well. He has seven top-10 finishes in 14 tournaments, including a sixth-place showing at the Masters. After his one-over 71 in the second round, Johnson was back to his best Saturday.

Both ESPN.com's Jason Sobel and Golf Channel's Justin Ray noted Johnson was in a similar position at the 2010 U.S. Open:

He held a three-shot lead over Graeme McDowell after 54 holes. By the time the tournament ended, Johnson wound up in a tie for eighth after a final-round 11-over 82.

A win at the 2015 U.S. Open would help exorcise some of those demons.

Whether it's Johnson, Spieth, Day or Grace, you'd expect that the winner will come from one of the four golfers currently tied for the lead.

Chambers Bay, located in University Place, Washington, has been extremely treacherous through the first three rounds, and scores have remained pretty low as a result. With a three-stoke buffer heading into Sunday, the four co-leaders are all in a great position to potentially capture the title.