Kei Nishikori Doubtful for US Open

Japan's Kei Nishikori is in doubt for the U.S. Open after he had a cyst removed from his right foot. (Also Read: Nadal Likely to Miss US Open)

Dr Robert Anderson performed the procedure on Monday in Charlotte, North Carolina. Nishikori's agent, Olivier Van Lindonk, says in an email that his client will fly to his U.S. home in Florida on Tuesday to begin his recovery.

Nishikori, the first Japanese man to reach the top 10 in the rankings, is No. 11 this week. He lost to Richard Gasquet in the quarterfinals in Washington on Friday. (Related: ATP Cancels Planned Israel Event Over Gaza Conflict)

Nishikori will miss next week's tournament in Cincinnati. The U.S. Open begins August 25.