IBF, WBA, WBO and IBO world boxing champion Wladimir Klitschko from Ukraine, right, knocks down challenger Kubrat Pulev from Bulgaria in the fifth round of their IBF heavyweight world championships title bout in Hamburg, Germany, Saturday, Nov. 15, 2014. (AP Photo/Martin Meissner)
IBF, WBA, WBO and IBO world boxing champion Wladimir Klitschko from Ukraine, right, knocks down challenger Kubrat Pulev from Bulgaria in the fifth round of their IBF heavyweight world championships title bout in Hamburg, Germany, Saturday, Nov. 15, 2014. (AP Photo/Martin Meissner)
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