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NEW YORK (AP) The U.S. Tennis Association says that former top-10 player Mardy Fish has pulled out of the U.S. Open for personal reasons.

The withdrawal is to be formally announced Wednesday. The tournament draw is Thursday, and play begins next week.

Fish has been trying to make a comeback on tour, having missed months at a time over the past two seasons after dealing with heart issues.

On Tuesday, the 31-year-old American retired in the third set of his match against Jarkko Nieminen at a hard-court tournament in Winston-Salem, N.C., citing heat stroke.

A year ago, Fish reached the fourth round at the U.S. Open but withdrew before he was to face Roger Federer at that stage, saying it was for "precautionary measures" on doctor's orders.