Just two months prior to his 50th birthday, veteran American boxer Bernard Hopkins began his 66th professional bout on Saturday evening when the unbeaten Russian Sergey Kovalev challenged him to unification fight for the WBO, IBF and WBA World light-heavyweight titles. Kovalev, who now lives in the United States, had never previously fought for 12 rounds in any fight but the 31year old demonstrated that he could maintain his superior speed