03/11/2005 1:00AM

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Vengeance of Rain, with his perfectly placed draw of post 6, holds a slight advantage over 13 rivals in Sunday's $1.8 million Hong Kong Derby at Sha Tin. Vengeance of Rain looms the favorite off his victory last out, in the Group 3 Centenary Vase at the Derby distance of 1 1/4 miles. . . . Robert J. Martin, a former jockey on the New England circuit, died of a stroke Thursday night at age 76 in a south Florida hospital. A funeral service is scheduled for 6 p.m. Sunday at Fred Hunter Funeral Home, 6301 Taft Street, Hollywood, Fla.