Two of the top Polish boxers went head to head in the gym, as super middleweight Piotr Wilczewski (30-2, 10 KOs) and cruiserweight Mateusz Masternak (25-0, 19 KOs) face off in a sparring session with their mutual coach Andrew Gmitruk watching on. Both fighters are going to see action in separate bouts later tonight on Kiel. Masternak faces Felipe Romero, while Wilcewski takes on WBO European champion Arthur Abraham in the main event. Photos by bokser.org.