Couples, Stadler, Marsh all out of U.S. Senior Open

Fred Couples, Craig Stadler and Graham Marsh all withdrew from next week's U.S. Senior Open, the USGA announced on Thursday.

Couples, the 2010 U.S. Senior Open runner-up, withdrew due to a back injury. John Harris will replace Couples in the field.

Stadler, who also pulled out due to a bad back, shared seventh at the 2004 and 2005 U.S. Senior Opens. David Ishii will take Stadler's place in the field.

Marsh's injury was undisclosed. The Australian won the 1997 U.S. Senior Open, and was the runner-up in 1994. Bruce Vaughan will take Marsh's place in the field. Vaughan was the 2008 Senior British Open champion.

The U.S. Senior Open kicks off July 10th at Oak Tree National.

[SportsNetwork.com]