Undefeated Adamek with 31-0 (21 KO) lost his first fight by unanimous decision to Chad Dawson on 3 February 2007. During that fight, Adamek was knocked down in the seventh round; this was only the second time in his career he has been knocked down (upon slow-motion replay, Adamek was shown to have tripped on Dawson's foot after the body shot). Adamek, well behind on points, provided some drama by suddenly dropping Dawson in the 10th round but Dawson fended off the onslaught that followed, and won a clear-cut points decision. Immediately following the loss to Dawson, Adamek decided to move up in the cruiserweight division.