There's no such thing as a quick 18 holes at the U.S. Open, particularly when it's at Oakmont. Players needed more than 5 1/2 hours or more to get through each of the opening two rounds, much slower than what they might find at a regular tour stop.

DeChambeau followed what his fellow SMU alum, the late Payne Stewart, accomplished 25 years earlier by winning the U.S. Open at Pinehurst. He is looking for his third U.S. Open title. After going even on the front nine, DeChambeau went 3-over on the back.

U.S. Open Golf Championship will continue on Friday with the second round at Oakmont Country Club in Pennsylvania.

U.S. Open at Oakmont is testing the world's best golfers like few tournaments do. Here's how the cut line works at golf's toughest major.

I'm playing old-man-par golf at the moment,” Adam Scott said of his eight birdies, eight bogeys and the rest pars after 36 holes at Oakmont.

There are no places to hide at a U.S. Open, particularly at Oakmont Country Club. There are no crevasses to crawl into or shadows to wait in. There are eyeballs on you the moment you first step foot onto the property.

Sam Burns earned the halfway lead at the U.S. Open on Friday to boost his hopes of a major breakthrough at Oakmont Country Club, where Rory McIlroy battled late to make the weekend and holder Bryson DeChambeau missed the cut.