Louis Oosthuizen has withdrawn from the Byron Nelson Championship before the final round because of a neck issue.
The United States heads into World Cup qualifiers against Costa Rica and Mexico with an inexperienced defense after dropping captain Carlos Bocanegra and learning eight players are injured or ill.
The 33-year-old Bocanegra, captain since 2007, has lost his starting job with Racing Santander in Spain's second division. He was in the U.S. squad for the 2-1 loss at Honduras last month in the final round of qualifying but didn't play.
Clint Dempsey put the Americans ahead in the 36th minute but the Americans, using a new-look defense that featured Omar Gonzalez and Timmy Chandler, gave up the lead when Juan Carlos Garcia tied the score in the 40th at San Pedro Sula.
The 30-year-old midfielder, a veteran of three World Cups and the American career leader in goals and assists, is taking a break from soccer following the Los Angeles Galaxy's second straight Major League Soccer title.
With injuries to Steve Cherundolo and Fabian Johnson, and Danny Williams' lack of playing time, the U.S. has defensive worries heading into next week's World Cup qualifier at Honduras, the opener in the final round to get to next year's tournament in Brazil.
Clint Dempsey has been voted the Futbol de Primera U.S. national team player of the year award for the second straight year and third time overall.
Mix Diskerud scored his first international goal in the third minute of injury time, giving the United States a 2-2 tie against Russia on Wednesday in an exhibition game at Krasnodar.
Eddie Johnson scored twice Friday night, including the winning goal in second-half injury time, lifting the United States to the verge of advancing in World Cup qualifying with a nervous 2-1 victory.