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NABA Welterweight Champion, Oscar Diaz, returns to the ring on Friday, May 30th at the Municipal Auditorium in San Antonio, Texas..The 25 year old Diaz, 25-2, will be stepping back into the ring after a 10 month layoff against veteran Roberto Valenzuela, 44-36 of Tucson, AZ. Diaz suffered a severe cut from a head but against Juan Buendia on July 14, 2007 which was followed by the tragic death of his father. [details]