Landry's opening-round 66 an Oakmont U.S. Open record

Andrew Landry shot a record low opening-round score for a U.S. Open at Oakmont as he wrapped up a stunning 66.

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Andrew Landry sunk a birdie putt after returning to the course on Friday to conclude his round at the ninth hole – his last.

Andrew Landry shot a record low opening-round score for a U.S. Open at Oakmont as he wrapped up a stunning 66.

The American sunk a birdie putt after returning to the course on Friday to conclude his round at the ninth hole – his last.

In so doing he wrote his name in the history books for the best first-round total on the occasion of Oakmont's ninth hosting of the major.

It gave him a clubhouse lead of two strokes. Storms played havoc with Thursday's scheduled play as half of the 156-man field were unable to take to the course.

Of those that did, Landry was one of a select few to shoot under par, with the likes of Danny Lee, Bubba Watson and Lee Westwood also near the top of the leaderboard.

Defending champion Jordan Spieth was two over through 13 holes, while Rory McIlroy was two worse off across the first 14 holes.

World No 1 Jason Day tees off at 09:00am local time.

McIlroy in US Open slump

Rory McIlroy's hopes of winning a second US Open were sent reeling at rain-hit Oakmont on Friday when a disastrous three-bogey finish to his first round saw him limp off the course with a seven-over 77.

That left him 11 shots off the early pace and in a battle just to make the cut.

The four-time major winner from Northern Ireland had ended the day Thursday at four-over after 13 holes after the players were called off the course due to dangerous weather conditions.

He had hoped for a run of birdies in the morning to claw his way back up the leaderboard, but instead he got bogeys as his waywardness off the tee was punished by the unforgiving eastern Pennsylvania layout.

"I felt like it was hard getting into any kind of rhythm," he said.

"I am missing shots left, I am missing shots right. I need to go to the range this afternoon and work on a few things if I'm going to be here for the weekend.

"I am just not in a good place with my swing."

The last time McIlroy missed the cut in a major was at the 2013 British Open held at Muirfield.

Organizers tweak schedule of weather-hit US Open

Danny Lee can have a relaxing evening after all after US Open officials confirmed Friday that his half of the field will start the second round of the rain-hit championship on Saturday.

With the tournament backed up after Thursday's thunderstorms, Lee had a provisional second-round tee time of 8:43pm (0143 GMT).

"That's past my dinner time," Lee said after wrapping up a one-under par first round of 69 on Friday morning that left him three shots behind clubhouse leader Landry.

Under the revised schedule announced on Friday, approximately half the field will aim to complete the first and second rounds by nightfall.

That will mean a quick turnaround for the likes of world number one Jason Day of Australia and five-time major winner Phil Mickelson, who began the first round on Friday morning and will be among those starting the second after 2:30 in the afternoon (1830 GMT).

The remainder of the field won't start the second round until Saturday morning, with round three slated to start shortly after the halfway cut is made.