FARMINGDALE, N.Y. — Shingo Katayama of Japan has withdrawn from the U.S. Open because of an injury to his upper back.
Katayama is No. 39 in the world ranking, and finished fourth at the Masters in April, two shots out of a playoff. He is the fourth player to withdraw from the U.S. Open, which starts Thursday at Bethpage Black.
He was replaced in the field by 19-year-old David Erdy of Indiana, the first alternate from sectional qualifying in Dayton, Ohio.
Erdy is the 16th amateur in the field, the most amateurs in more than a decade.
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Dudley Hart, Robert Karlsson and former Masters champion Trevor Immelman have also withdrawn in recent days.
Pinehurst to host Open double
The USGA said Monday the U.S. Open and U.S. Women's Open will be held over consecutive weeks in 2014 at Pinehurst No. 2, the first time in golf that women have a chance to share the stage with the men.
"It's a big opportunity," said USGA executive director David Fay, who came up with the idea. "I really do think this will generate some buzz for women's golf and the Women's Open. And I think a lot of people will take advantage."
The U.S. Open already was scheduled to return to Pinehurst in 2014 for the third time in 15 years. The Women's Open has been held three times at nearby Pine Needles since 1996, but never at the fabled No. 2 course at Pinehurst.
"It seems like a good move," David Duval said. "The course is already set up and ready to play. And their tee boxes will be that much more pristine."