Graeme McDowell knows how quickly it all can change on Sunday at the U.S. Open.
Lee Westwood has been here 57 times before.

Graeme McDowell and Jim Furyk, a pair of U.S. Open champions, managed to beat par at The Olympic Club.
The real star of this U.S. Open won't swing a golf club even once this week. Most fans couldn't pick him out of a lineup. No matter how aggravating The Olympic Club plays, he barely has enough hair left to pull any out.
The expectations came back before Tiger Woods did.
Somewhere along The Olympic Club's tight, twisting fairways, 17-year-old Beau Hossler went from thinking he could be the low amateur to believing he could win the whole tournament.
The kid came into the U.S. Open hoping to finish as low amateur and maybe even shake hands with his hero, Phil Mickelson. Modest goals, maybe, but Beau Hossler wasn't even the best player in his state high school tournament a few weeks ago.
Day 2 of the U.S. Open has begun with 155 players all chasing leader Michael Thompson.
Tiger Woods is back to twirling his clubs at a major instead of kicking them.