Sergio Martinez, background, of Oxnard, Calif., celebrates after knocking out Darren Barker, of London, England, in the 11th round of WBC World Middleweight Diamond Belt Championship Bout boxing match in Atlantic City, N.J., on Saturday, Oct. 1, 2011. Martinez won by knockout in the 11th round. ((AP Photo/Tim Larsen))
October 2, 2011 5:58:58 AM PDT
ATLANTIC CITY, N.J. - October 2, 2011 --
Argentina's Sergio Martinez retained the WBC Diamond middleweight title, stopping Englishman Darren Barker in the 11th round Saturday night at Boardwalk Hall.