During 1895 at Los Angeles, Jeffries won his first professional fight by knocking out Hank Griffin in fourteen rounds. Griffin was a veteran of more than 100 fights.

On March 22, 1898 at San Francisco, Jeffries knocked out the aging but great boxer-puncher, Peter Jackson, in three rounds.

On June 9, 1899 at Coney Island, Jeffries knocked out Bob Fitzsimmons in eleven rounds to capture the Heavyweight Championship of the World.

On November 3, 1899 at Coney Island, Jeffries defeated Tom Sharkey in 25 grueling rounds to retain his title in his first defense. Jeffries won despite an arm injury in what many historians consider as the greatest heavyweight fight in history.

On May 13, 1905, Jeffries retired from boxing

Jeffries has been called the greatest heavyweight of all-time by numerous boxing people -- Jim Corbett, Jack Dempsey, Tommy Burns, Willie Ritchie, and Tom Sharkey to name five.

Jack Johnson, the first black Heavyweight Champion and the only man to beat Jeffries, also called Jim the greatest heavyweight of all-time.

Sam Langford, the great light-heavyweight fighter, even advertised in papers to fight any man in the world except Jim Jeffries.