Klitschko KOs Chambers to keep titles

World heavyweight champion Wladimir Klitschko knocked out U.S. challenger Eddie Chambers with five seconds remaining in the 12th and final round to defend his IBF, WBO and IBO titles.

The Saturday bout in Duesseldorf, Germany, was the 33-year-old Ukrainian's fifth defense of his WBO and IBF titles.

Chambers went down for at least two minutes after receiving Klitschko's left hook to the right temple.