August 24, 2007 -- The tennis-prodigy niece of former Knick star Kiki Vandeweghe was stunned when a referee told her to remove her American flag patch just before her debut at the U.S. Open. Coco Vandeweghe, 15, one of the most promising young American women players, was unnerved by the bizarre incident before her first-round qualifying match at the U.S. Tennis Center in Queens on Wednesday. She was warming up for her match against Spain's Maria José Martinez Sanchez when an assistant referee pulled off Coco's Stars and Stripes patch, a U.S. Tennis Association official said yesterday. "They profusely apologized...