Muhammad Ali (born Cassius Marcellus Clay, Jr.) is a former boxer and three-time World Heavyweight Champion, who is widely considered one of the greatest heavyweight championship boxers. As an amateur, he won a gold medal in the light heavyweight division at the 1960 Summer Olympics in Rome. After turning professional, he went on to become the first boxer to win the lineal Heavyweight Championship three times.

Joe Frazier is a former Olympic and World Heavyweight
boxing champion whose professional career lasted from
1965 to 1976, with a brief comeback in 1981.

Frazier’s last world title match came in 1975 when he was
defeated by Muhammad Ali. It has been called the “Thrilla
in Manila”.