Who was the opponent in Muhammad Ali's last professional fight?

Muhammad Ali's final professional opponent was Trevor Berbick.

The fight, promoted as “Drama in Bahama,” took place on December 11, 1981, at the Queen Elizabeth Sports Centre in Nassau, Bahamas. Berbick won the ten-round bout by unanimous decision, with the judges scoring it 99–94, 99–94, and 97–94. Ali was 39 years old and entered the contest after his difficult loss to Larry Holmes the previous year.

The match was Ali's last professional boxing appearance. It is sometimes confused with his previous fight against Holmes, another former heavyweight champion, but Holmes was not Ali's final opponent. Berbick was a Jamaican heavyweight who later won the WBC heavyweight title in 1986 and lost it to Mike Tyson in Tyson's breakthrough championship victory. Ali retired with a professional record of 56 wins, 5 losses, and 37 knockouts.