Oakmont Country Club

The U.S. Open is traditionally golf's toughest major. This week, the nation's championship turns to arguably its nastiest venue, Oakmont.

The best in the world have started their practice rounds in suburban Pittsburgh. And the rough is so bad, they can only laugh at it.

Here's Justin Thomas dropping a ball into the grass version of quicksand.

Rough short of 17 green... Yeah, I'd say Oakmont is ready @usopengolf

A video posted by Justin Thomas (@justinthomas34) on

Keegan Bradley claims there is a ball in this picture:

Can u find the ball? #ipromisethereisone #oakmont

A photo posted by Keegan Bradley (@keeganbradley1) on

Graeme McDowell, winner of the 2010 U.S. Open at Pebble Beach, swings at the rough and somehow a ball pops out of the ground:

Back to the traditional US Open set up here at Oakmont.

A video posted by Graeme McDowell (@graeme_mcdowell) on

AP golf writer Doug Ferguson was not so lucky.

Angel Cabrera won the last U.S. Open at Oakmont in 2007, at +5, tied for the highest winning score since 1974. With rain expected in the forecast and beanstalks like that on the course, the 2016 mark could be even higher.

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