South African golfer Trevor Immelman, the 2008 Masters champion, withdrew from the U.S. Open Sunday night because of tendinitis in his left wrist and elbow.
Shingo Katayama of Japan also withdrew from the U.S. Open Monday morning, the United States Golf Association announced. Katayama, who finished fourth at the Masters in April, has an upper back injury.
Clinton Jensen, the first alternate from sectional qualifying in Florida, will serve as the replacement for Immelman. Nineteen-year-old David Erdy of Indiana, from the Deer Lick, Ind. qualifier, will replace Katayama in the field.
The withdrawals of Katayama and Immelman make them the second and third players in the top 50 world rankings to withdraw from competition after Robert Karlsson of Sweden had to pull out last week because of an eye infection. Karlsson, currently ranked 14th in the world, finished tied for fourth place in last year's U.S. Open at Torrey Pines.