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Tommy Haas needs a fourth operation on his right shoulder and will miss the rest of the tennis season.

The 20th-ranked German retired from his opening match at the French Open last month and withdrew from last week's Gerry Weber Open in Halle to assess the injury.

The 36-year-old player's management company said Monday that Haas has three damaged tendons in his right shoulder, which was operated on in 2002, 2003 and 2007.

Haas says "the diagnosis was a real shock" and surgery "can't be avoided because the injury is very serious."

Haas, once ranked No. 2 in the world, will undergo surgery Tuesday in New York.

He says he no plans to retire and hopes for a comeback in 2015.

Haas says "I'm still totally convinced I've good matches and tournaments ahead of me."