The 125th edition of the U.S. Open returns to the USGA's favorite stomping grounds for the first time in nine years as Oakmont Country Club hosts the national championship for the 10th time in tournament history.

Whoever comes out on top at Oakmont County Club in the 125th U.S. Open will be a worthy champion. Here are the betting favorites to win the toughest test on the golf calendar.

Rory McIlroy disclosed what he shot during a practice round at Oakmont ahead of the U.S. Open, and its 'Toughest Test in Golf' title seems to hold.

Professional golfer Rory McIlroy isn't holding back on his opinions about the U.S. Open's notoriously tricky Oakmont Country Club course. Coming off his Masters victory, McIlroy is obviously one of the top golfers to watch at the tournament,

But there is no denying that the McIlroy we saw last week in Canada and the McIlroy we saw Quail Hollow appear to be an entirely different player than the one we saw at Augusta National. Of course, the well-documented driver issues could certainly be to blame,