Original: After 1957 , his fighting skills diminished , although Baker defeated George Chuvalo , a future Canadian champion and multiple world heavyweight title contender in the 1960s and 1970s , by unanimous decision , on September 9 , 1957 .
Simplified: His most notable victory was a sound defeat of Canadian George Chuvalo , the future Canadian heavyweight champion , by unanimous decision on September 9 , 1957 .