1 / 35

The prize the field are competing for at Torrey Pines. PHOTO: Jeff Haynes/USGA.

2 / 35

The sight that greeted the early starters on Thursday morning. PHOTO: John Mummet/USGA.

3 / 35

The first group of the US Open finally sets off after the fog begins to lift. PHOTO: Jeff Haynes/USGA.

4 / 35

Tees anyone? PHOTO: Jeff Haynes/USGA.

5 / 35

The driver and golf ball of first round co-leader Russell Henley. PHOTO: Jeff Haynes/USGA.

6 / 35

Pre-tournament favourite Jon Rahm had an up and down day for two-under. PHOTO: Jeff Haynes/USGA.

7 / 35

Tony Finau plays in the shade of one of the Torrey Pines. PHOTO: Jeff Haynes/USGA.

8 / 35

Is this thing on? PHOTO: Jeff Haynes/USGA.

9 / 35

Adam Scott rolled in a birdie at the last to finish one-under and right in it. PHOTO: Jeff Haynes/USGA.

10 / 35

Ryo Ishikawa can't quite believe his luck as he returns to the major stage. PHOTO: Jeff Haynes/USGA.

11 / 35

Paul Casey splashes one from the bunker in the shadows. PHOTO: Ezra Shaw/Getty Images.

12 / 35

A fan takes a break from the action in the lonf rough. PHOTO: Rob Beck/USGA.

13 / 35

Defending champion Bryson DeChambeau battled to a two-over opening round. PHOTO: Sean M. Haffey/Getty Images.

14 / 35

Rory McIlroy celebrates a chip-in birdie at the 7th hole. PHOTO: Jeff Marsh/USGA.

15 / 35

Francesco Molinari reminded the world how good a player he is with a three-under 68. PHOTO: Jeff Haynes/USGA.

16 / 35

This fan had a great view of Bubba Watson's unique swing. PHOTO: Kohjiro Kinno/USGA.

17 / 35

Rory splashes one from the bunker. PHOTO: Rob Beck/USGA.

18 / 35

Marc Leishman signals a wide during his 74. PHOTO: Darren Carroll/USGA.

19 / 35

Viktor Hovland's Aussie caddie Shay Knight was clearly enjoying himself. PHOTO: Rob Beck/USGA.

20 / 35

A winner at this course already this year, Patrick Reed wasn't quite as happy at Torrey Pines today. PHOTO: Harry How/Getty Images.

21 / 35

Amateur Matthias Schmid left no doubts as to where he comes from. PHOTO: Darren Carroll/USGA.

22 / 35

McIlroy had some LA inspired footwear on Thrusday. PHOTO: Rob Beck/USGA.

23 / 35

It's a major, so of course Brooks Koepka is in the mix after a two-under round. PHOTO: Sean M. Haffey/Getty Images.

24 / 35

Xander Schauffele is sticking with his new green reading technique, probably helps his physique too. PHOTO: Ezra Shaw/Getty Images.

25 / 35

Phil Mickelson did not get off to the start he wanted and digs one out of the long stuff. PHOTO: Ezra Shaw/Getty Images.

26 / 35

Wade Ormsby is watched by a fan with the best free seat in the house. PHOTO: Ezra Shaw/Getty Images.

27 / 35

Ormsby is embracing the moustache look in California this week. PHOTO: Sean M. Haffey/Getty Images.

28 / 35

Queenslander Brad Kennedy keeps a close eye on this one during a 74. PHOTO: Sean M. Haffey/Getty Images.

29 / 35

Max Homa clearly cannot believe some of the breaks at Torrey. PHOTO: Ezra Shaw/Getty Images.

30 / 35

English veteran has seemingly had his ball on a string of late. PHOTO: Ezra Shaw/Getty Images.

31 / 35

Mullet and Mo in full flight for Cam Smith, who is one of the players back early on Friday. PHOTO: Sean M. Haffey/Getty Images.

32 / 35

Matt Jones, playing with Smith, is one over with two to play. PHOTO: Sean M. Haffey/Getty Images.

33 / 35

Adam Scott exits one of the large South Course bunkers. PHOTO: Sean M. Haffey/Getty Images.

34 / 35

Interesting follow through, or maybe product placement, here from Charl Schwartzel. PHOTO: Sean M. Haffey/Getty Images.

35 / 35

These ducks had clearly seen enough for the day. PHOTO: Kohjiro Kinno/USGA.