These are my fav's not in any order

Holyfield - Bowe I
Foreman - Lyle
Holyfield- Bert Cooper
Micheal Moorer - Bert Cooper
David Tua - vs- Ike Ibeabuchi
Ali -vs- Frazior
Ali - Norton
maybe not of all time, but i really enjoyed it Foreman -vs- Cooney
Foreman -vs- Moorer ( George losing and then finding the homerunner late in th fight )
Tyson - Douglas
Tyson -vs -Holyfield I