Q:What type of details about nikolai valuev can be gathered from the following bio? Bio: nikolai sergeyevich valuev -lrb- born august 21 , 1973 -rrb- is a russian former professional boxer . he is a former two-time wba heavyweight champion . after a professional career spanning 16 years , valuev officially retired from the sport in november 2009 . his final fight was a wba heavyweight title defense against david haye , in which he was defeated by majority decision after twelve rounds . valuev has defeated three world champions in john ruiz , siarhei liakhovich and evander holyfield , as well as top contenders such as clifford etienne , larry donald , owen beck , monte barrett and jameel mccline . he resides in his birthplace st. petersburg , russia with his wife and two children .
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- reach - weight - losses - height - ko - style - nickname - realname - total - birth date - name - nationality - image - birth place - wins