When Joe the Brown Bomber won the world heavyweight title by stopping champion James Braddock in June 1937, he said, “I'm not champion until I beat Max Schmeling!” He was talking about his KO loss in 1936. He got his revenge at Madison Square Garden in 1939, knocking out Smelling in the first round.

When 'Sugar' Ray Leonard, 27-0, lost to Roberto 'Hands of Stone' Duran, 71-1, the Durans fought in June 1980, earning him a rematch. He boxed Duran so badly that Duran left the mall in November.

In April 1987, Leonard defeated Marvin Hagler for his middleweight title. Hagler retired and moved to Italy, not seeking a rematch.

In April 2002, lightweight champion Floyd 'Money' Mayweather was awarded a decision to Jose Luis Castillo. Eight months later, he defeated him easily in a rematch.

In June 2012, Manny 'Pac Man' Pacquiao was knocked out by Tim Bradley, Jr., but in April 2014, he defeated Bradley in a rematch.

In November 2016, Andre “SOG” Ward got a gift decision over Sergey Kovalev in a light heavyweight title fight and gave him an immediate rematch, stopping Kovalev, then retired from boxing.

Heavyweight champion Rock Marciano won a close, if not controversial, decision against Roland Lasterza in March 1950 before winning the title. After stopping 'Jersey' Joe Walcott for the title and again in his next fight, he stopped Lasterza.

In November 1986, super featherweight champion Alfredo Escalera won his worst split decision over Tyron Everett of Philadelphia. He never got a rematch and the Pennsylvania judge who voted Escalara never worked another show.

Historian Jim Jacobs told me the worst decision he ever saw was in June 1963, when light heavyweight champ Harold Johnson was knocked out by Willie Pastrano via split decision and didn't get a rematch.

Heavyweight champion Muhammad Ali lost to Ken Norton and Smokin' Joe Frazier in their first bout but was defeated twice in the rematch.

In June 1983, heavyweight champ Larry 'The Easton Assassin' Holmes, 42-0, won a 15-0 defense against 'Terrible' Tim Witherspoon by a gift decision and was never granted a rematch.

Any fight you wanted to see in a rematch that never happened?