Former WBO junior lightweight champion Joan Guzman, 28-0 (17), will be back in the ring before the year ends. Guzman will travel to his native Dominican Republic to take on WBA Fedelatin lightweight champion Ameth Diaz, 25-7 (19), on Saturday, Dec. 20, 2008, from El Palacio de los Deportes in Guzman’s hometown of Santo Domingo.