'The Greatest' becomes a pro

Ed Mulholland/WireImage

Muhammad Ali and Laila Ali combined for an 80-5 record during the course of their professional careers.

On this day in 1960, Muhammad Ali -- then known as Cassius Clay -- made his professional boxing debut at age 18. After winning the gold medal in the light heavyweight division at the 1960 Olympics in Rome, Ali won a six-round decision over Tunney Hunsaker in Louisville, Ky. Nicknamed “The Greatest,” Ali complied a 56-5 career record and is widely considered the best heavyweight fighter of all time with his three title belts and revolutionary talent and speed. Also revered for his social activism, Ali is still considered one of America’s most legendary and influential athletes. His daughter, Laila Ali, followed in his footsteps and became the two-time super middleweight champion and amassed a 24-0 record in her professional career.