Sweden's Henrik Stenson and American Dustin Johnson hold a joint-lead after day one of the US Open at a testing Chambers Bay.
The duo both shot a five-under round of 65 in Tacoma, Washington to set the pace in the second major of 2015, but there are a host of players in the chasing pack.
USA's Patrick Reed, Ben Martin and amateur Ben Campbell after four-under, while Matt Kuchar, Jason Day from Australia, Cody Gribble and record-breaking Masters champion Jordan Spieth are among the players in pursuit.
"I had a great start but then had a couple of frightening holes in the middle of the front nine," Stenson said.
"But I holed some bombs late on. It is a tricky course. I think they did a good job setting it up.
"I'm expecting a few more five-under-par rounds and then [the USGA] could easily make it a different animal by the end of the week."
Tiger Woods had a nightmare day, carding 80 - 10 over par - and needing something close to a miracle to make the cut.
Phil Mickelson, a five-time runner-up at his home major championship, is in contention after a first round 69 but a host of the pre-tournament favourites are off the pace including world number one Rory McIlroy, who is two-over.
The Northern Irishman said: "I thought the course was set up well. It was set up so you can score well. It is out there with the conditions as there is no breeze.
"If anything it reiterated what I was thinking coming in to this week that you can be really aggressive with your tee shots and go for certain pins.
"It is not a typical US Open where you have to play a game of chess. I need more of the games from tee to green and try to figure something on the greens."
After a flurry of low scores in the morning groups, which included a one-under round from 51-year-old Colin Montgomerie, the afternoon groups suffered amid the increasingly dry greens, the quality of which has been called into question by several players.