1 of 12
Defending champion Tiger Woods is once again the focus of attention playing alongside Ernie Els and amateur Ricky Barnes

2 of 12
Justin Leonard hits six birdies on his way to a four-under-par round of 66, earning him the early clubhouse lead

3 of 12
Colin Montgomerie is at the top of the leaderboard at one point but he fades to finish on one under after a round of 69

4 of 12
American amateur John Bradley Holmes runs into some difficulty during his six-over-par round of 76

5 of 12
Tiger Woods makes a solid but unspectacular start hitting eight straight pars before a bogey five at the 18th

6 of 12
Woods hits an eagle at the sixth (his 15th) but cards a bogey at the last to finish the day down the leaderboard on level par

7 of 12
South Africa's Ernie Els hits a birdie at the 14th in a round otherwise consisting of pars to finish the day one under

8 of 12
South African Rory Sabbatini delights the crowd at Olympia Fields with an eagle at the first, he finishes on three over

9 of 12
England's Justin Rose has a chequered round, hitting four bogeys and four birdies as he finishes on level par

10 of 12
Ireland's Padraig Harrington held a share of the early lead but drops back to finish on one under par

11 of 12
Qualifier Brett Quigley is the day's surprise package, storming into contention with a round of five-under to share the lead

12 of 12
1982 champion Tom Watson shares the overnight lead with Quigley, two birdies in three holes helping him to five under