Compiling a list of the 50 greatest heavyweight fights

Why? Because I fancied doing it.

Give me some picks that you personally think are essential but avoiding the obvious - the rarer the better. I'm looking to populate 21-50 more than 1-20.

EDIT: Here's the full list of fights mentioned so far in this thread in rough chronological order:

Pre-20th Century - bareknuckle era:
[ ] Bob Whitaker Vs The Venetian Gondalier (1733)
[ ] Jack Slack Vs Monsieur Petit (1751)
[ ] Hen Pearce Vs John Gully (1805?)
[ ] Hen Pearce Vs Jem Belcher (1805)
[ ] Tom Cribb Vs Tom Molyneaux (1810 and 1811)
[ ] Tom Sayers Vs John C Heenan (1860)

20th Century:
[ ] Gus Ruhlin v Peter Maher 1 (1900)
[ ] Joe Jeanette v Sam McVey (1907-1915)
[ ] Jack Johnson v Stanley Ketchel (1909)
[ ] Jack Johnson v Jim Jeffries (1910)
[ ] Jack Dempsey v Jess Willard (1919)
[ ] Jack Demspey v Luis Firpo (1923)
[ ] Jack Dempsey v Jack Sharkey (1927)
[ ] Gene Tunney v Jack Dempsey (1927)
[ ] James Braddock v Max Baer (1935)
[ ] Joe Louis v Max Baer (1935)
[ ] Max Schmeling v Joe Louis 1 (1936)
[ ] Joe Louis vs James J Braddock (1937)
[ ] Joe Louis v Max Schmeling 2 (1938)
[ ] Joe Louis vs Tony Galento (1939)
[ ] Joe Louis v Buddy Baer 1 (1941)
[ ] Joe Louis v Billy Conn 1 (1941)
[ ] Joe Louis v Buddy Baer 2 (1942)
[ ] Joe Louis vs Jersey Joe Walcott I (1947)
[ ] Joe Louis vs Jersey Joe Walcott II (1948)
[ ] Ezzard Charles v Joe Louis (1950)
[ ] Jersey Joe Walcott v Ezzard Charles 3 (1951)
[ ] Rex Layne v Bob Satterfield (1951)
[ ] Rocky Marciano v Rex Layne (1951)
[ ] Rocky Marciano v Jersey Joe Walcott 1 (1952)
[ ] Charley Norkus v Danny Nardico 1 (1954)
[ ] Rocky Marciano v Ezzard Charles 1 (1954)
[ ] Rocky Marciano v Ezzard Charles 2 (1955)
[ ] Rocky Marciano v Archie Moore (1955)
[ ] Ingemar Johansson v Floyd Patterson 1 (1959)
[ ] Sonny Liston v Cleveland Williams 1 (1959)
[ ] Floyd Patterson v Ingemar Johansson 2 (1960)
[ ] Sonny Liston v Cleveland Williams 2 (1960)
[ ] Floyd Patterson v Ingemar Johansson 3 (1961)
[ ] Cassius Clay v Doug Jones (1963)
[ ] Floyd Patterson v George Chuvalo (1965)
[ ] Joe Frazier v Oscar Bonavena (1966)
[ ] Joe Frazier v Eddie Machen (1966)
[ ] Joe Frazier v George Chuvalo (1967)
[ ] Floyd Patterson v Jerry Quarry 1 (1967)
[ ] Floyd Patterson v Jerry Quarry 2 (1967)
[ ] Jimmy Ellis v Floyd Patterson (1968)
[ ] Leotis Martin v Thad Spencer (1968)
[ ] Joe Frazier v Buster Mathis (1968)
[ ] Joe Frazier v Manuel Ramos (1968)
[ ] Joe Frazier v Jerry Quarry 1 (1969)
[ ] Joe Frazier v Jimmy Ellis 1 (1970)
[ ] Joe Frazier v Muhammad Ali 1 (1971)
[ ] Ken Norton v Muhammad Ali 2 (1973)
[ ] Joe Frazier v Jerry Quarry 2 (1974)
[ ] Muhammad Ali v George Foreman (1974)
[ ] Ron Lyle v Earnie Shavers (1975)
[ ] Muhammad Ali v Joe Frazier 3 (1975)
[ ] George Foreman v Ron Lyle (1976)
[ ] Muhammad Ali v Ken Norton 3 (1976)
[ ] Earnie Shavers v Roy Williams (1976)
[ ] Leon Spinks v Scott LeDoux (1977)
[ ] Muhammad Ali v Earnie Shavers (1977)
[ ] Leon Spinks vs Muhammad Ali 1 (1978)
[ ] Larry Holmes v Ken Norton (1978)
[ ] Larry Holmes v Mike Weaver (1979)
[ ] Larry Holmes v Earnie Shavers 2 (1979)
[ ] Ken Norton v Scott LeDoux (1979)
[ ] Mike Weaver v John Tate (1980)
[ ] Mike Weaver v Gerrie Coetzee (1980)
[ ] Leon Spinks vs Eddie Lopez (1980)
[ ] Leon Spinks vs Bernardo Mercado (1980)
[ ] Ken Norton v Randall Cobb (1980)
[ ] Marty Monroe v Lynn Ball (1980)
[ ] Larry Holmes v Renaldo Snipes (1981)
[ ] Greg Page v George Chaplin (1981)
[ ] Mike Weaver v Michael Dokes 2 (1982)
[ ] Trevor Berbick v Renaldo Snipes (1982)
[ ] Leon Spinks vs Jesse Burnett (1982)
[ ] Larry Holmes v Gerry Cooney (1982)
[ ] Greg Page v James Tillis (1982)
[ ] Larry Holmes v Tim Witherspoon (1983)
[ ] Gerrie Coetzee v Michael Dokes (1983)
[ ] Greg Page v Gerrie Coetzee (1984)
[ ] Pinklon Thomas v Mike Weaver (1985)
[ ] Larry Holmes v Carl Williams (1985)
[ ] Michael Spinks v Larry Holmes 1 (1985)
[ ] Michael Spinks v Larry Holmes 2 (1986)
[ ] Mike Tyson v James Tillis (1986)
[ ] Mike Weaver v Carl Williams (1986)
[ ] Buster Douglas v Greg Page (1986)
[ ] Mark Wills v Greg Page 1 (1986)
[ ] Greg Page v James Broad (1987)
[ ] Evander Holyfield v Alex Stewart 1 (1988)
[ ] Evander Holyfield v Michael Dokes (1989)
[ ] James Douglas v Mike Tyson (1990)
[ ] Ray Mercer v Bert Cooper (1990)
[ ] Mark Wills v Greg Page 2 (1990)
[ ] George Foreman v Gerry Cooney (1990)
[ ] Pierre Coetzer v Johnny DuPloy (1990)
[ ] Mike Tyson v Donovan Ruddock 1 (1991)
[ ] Ray Mercer v Tommy Morrison (1991)
[ ] Michael Moorer v Alex Stewart (1991)
[ ] Evander Holyfield v George Foreman (1991)
[ ] Michael Moorer v Bert Cooper (1992)
[ ] Larry Holmes v Ray Mercer (1992)
[ ] Tommy Morrison v Joe Hipp (1992)
[ ] Riddick Bowe v Evander Holyfield 1 (1992)
[ ] Tommy Morrison v Carl Williams (1993)
[ ] Lennox Lewis v Frank Bruno (1993)
[ ] Evander Holyfield v Riddick Bowe 2 (1993)
[ ] George Foreman v Michael Moorer (1994)
[ ] Larry Holmes v Jesse Ferguson (1994)
[ ] Evander Holyfield v Ray Mercer (1995)
[ ] Riddick Bowe v Evander Holyfield 3 (1995)
[ ] Tommy Morrison v Donovan Ruddock (1995)
[ ] David Tua v David Izon (1996)
[ ] Michael Moorer v Frans Botha (1996)
[ ] Andrew Golota v Dannel Nicholson (1996)
[ ] Riddick Bowe v Andrew Golota 1 (1996)
[ ] Riddick Bowe v Andrew Golota 2 (1996)
[ ] Ray Mercer v Tim Witherspoon (1996)
[ ] Lennox Lewis v Ray Mercer (1996)
[ ] Ike Ibeabuchi v David Tua (1997)
[ ] Lennox Lewis v Shannon Briggs (1998)
[ ] Evander Holyfield v Michael Moorer 2 (1998)
[ ] David Tua v Hashim Rahman 1 (1998)
[ ] Alex Stewart v Ezra Sellers (1998)
[ ] Andrew Golota v Corey Sanders (1998)
[ ] Derek Jefferson v Maurice Harris (1999)
[ ] Michael Grant v Andrew Golota (1999)
[ ] Shannon Briggs v Frans Botha (1999)
[ ] Oleg Maskaev v Hashim Rahman (1999)
[ ] Lennox Lewis v Evander Holyfield 2 (1999)

21st Century:
[ ] Clifford Etienne v Lamon Brewster (2000)
[ ] Clifford Etienne v Lawrence Clay Bay (2000)
[ ] Hashim Rahman v Corrie Sanders (2000)
[ ] Evander Holyfield v Hashim Rahman (2002)
[ ] James Toney v Evander Holyfield (2003)
[ ] David Tua v Hashim Rahman 2 (2003)
[ ] Lennox Lewis v Vitali Klitschko (2003)
[ ] Andrew Golota v Chris Byrd (2004)
[ ] Lamon Brewster vs Wladimir Klitschko 1 (2004)
[ ] Monte Barrett v Owen Beck (2005)
[ ] Lamon Brewster v Sergei Liakovich (2006)
[ ] Samuel Peter v James Toney 1 (2006)
[ ] Tyson Fury v John McDermott 1 (2009)
[ ] Wladimir Klitschko v Samuel Peter (2010)
[ ] Monte Barrett v David Tua 1 (2010)
[ ] Monte Barrett v David Tua 2 (2011)
[ ] Alexander Povetkin v Ruslan Chagaev (2011)
[ ] Alexander Povetkin v Marco Huck (2012)
[ ] Tyson Fury v Steve Cunningham (2013)
[ ] Tony Thompson v David Price 2 (2013)
[ ] Alexander Povetkin v Carlos Takam (2014)
[ ] Deontay Wilder v Eric Molina (2015)
[ ] Anthony Joshua v Dillian Whyte (2015)
[ ] Anthony Joshua v Dillian Whyte (2016)
[ ] Dillian Whyte vs Derek Chisora 1 (2016)
[ ] Anthony Joshua v Wladmir Klitschko (2017)
[ ] Dominic Breazeale v Izuagbe Ugonoh (2017)
[ ] Deontay Wilder v Luis Ortiz 1 (2018)
[ ] Tyson Fury v Deontay Wilder 1 (2018)
[ ] Alexander Povetkin v David Price (2018)
[ ] Anthony Joshua vs Alexander Povetkin (2018)
[ ] Dillian Whyte vs Joseph Parker (2018)
[ ] Dillian Whyte vs Derek Chisora 2 (2018)
[ ] Alexander Povetkin v Michael Hunter (2019)
[ ] Anthony Joshua vs Andy Ruiz 1 (2019)
[ ] Deontay Wilder v Luis Ortiz 2 (2019)
[ ] Tyson Fury v Otto Wallin (2019)
[ ] Tyson Fury v Deontay Wilder 2 (2020)
[ ] Alexander Povetkin v Dillian Whyte 1 (2020)

 

Well, that was part of why I was doing it - is it even possible? I reckon there are.