Muhammad Ali fought three boxing matches with Ken Norton. The first match took place on March 31, 1973; the second on September 10, 1973; and the third on September 28, 1976. Norton won the first match through a split decision on points while Ali won the second match through a split decision on points. Ali also won the third match through a unanimous decision on points.
References
Muhammad Ali vs. Ken Norton Wikipedia(Text) CC BY-SA