Under the guidance of his trainer Kostya Tszyu, WBA "regular" heavyweight champion Alexander Povetkin of Russia was putting in a lot of work for his upcoming defense against fomer two-time WBC beltholder Hasim Rahman of the United States. The fight takes place on Saturday night in Hamburg, Germany and Sauerland Event will promote the card. Povetkin was sparring hard with 32-year-old British contender John McDermott and 33-year-old American boxer Excell Holmes. In addition, Povetkin put in several rounds with 32-year-old Russian MMA fighter Sergei Kharitonov. Photos by Victor Sokolov/Allboxing.ru.