The Olympic Club's Lakes course has been playing just as hard as many believed it would heading into the week if not more, claiming a number of the world's best golfers early in the 2012 U.S. Open. Here's a closer look at some of those who have really struggled so far this week:

Rory McIlroy: +9 thru seven holes

Luke Donald: +9 thru seven holes

Bubba Watson: +8 tees off at 1:18

Louis Oosthuizen: +8 thru three holes

Zach Johnson: +7 tees off at 1:25

Adam Scott: +6 tees of at 1:47

Phil Mickelson: +6 tees off at 1:18

These guys are going to have to get it together if they want to be around for the weekend, hopefully a high cut line will aid a few of them in their quest for a paycheck.

Full leaderboard can be found here.

For more in depth coverage including live video, highlights, player interviews and more during the 2012 U.S. Open, make sure that you check out the USGA's ongoing coverage as well as SB Nation's dedicated golf hub.