Wladimir Klitschko retains world heavyweight belts
Related mediaWladimir Klitschko vs. Tony Thompson
The 36-year-old champion Klitschko, 58-3 with 51 knockouts, floored Thompson with a big right hand near the end of the fifth round at Stade de Suisse, and the 40-year-old American never recovered.
The Ukrainian champion dropped Thompson again in the sixth, and referee Sam Williams gave the challenger a standing count before stopping the fight.
In 2008, Klitschko stopped Thompson in the 11th round.
Thompson, who was the mandatory challenger nominated by the IBF, dropped to 36-3.