Puritty forced Klitschko, who had at that time not gone beyond 8 rounds, to punch himself out.
Klitschko began to be overwhelmed in the 10th round and went down twice but was allowed to continue.
On unsteady legs, Klitschko fell to the canvas after the bell and the referee stopped the fight for his safety.
The fight was halted because of a Klitschko cut caused by an accidental headbutt.
Byrd had previously upset his elder brother Vitali (who pulled out injured during their bout).Klitschko sent Brewster to the canvas in the fourth round; however, things turned around in the fifth when Brewster's punches began backing him up.Not defending himself and leaning into ropes for support, Klitschko took a standing eight count.From 2006 to 2015, Wladimir and his older brother Vitali (himself a former world heavyweight champion) dominated heavyweight boxing, a period typically known as the "Klitschko Era" of the division.His father, Vladimir Rodionovich Klichko (1947–2011), was a Soviet Air Force major general and a military attaché of Ukraine in Germany; he was also one of the commanders in charge of cleaning up the effects of the Chernobyl disaster in 1986 and was afterward diagnosed with cancer. He is the younger brother of former WBC, WBO and Ring magazine heavyweight champion Vitali Klitschko, the current Mayor of Kiev.