A battle of undefeateds, as WBO light heavyweight champion Nathan Cleverly (left) and hard-punching challenger Sergey Kovalev, went face to face at the final press conference. The two fighters will trade punches on Frank Warren's big show, which takes place this Saturday night at the Motorpoint Arena in Cardiff, Wales. The fight will be televised by BoxNation and HBO. Both fighters have predicted knockout victories, with Kovalev making a bold prediction of stopping Cleverly within three rounds.