Date
Champions
Opponents
Score, Location

World Boxing Organization
1994-03-19
HIDE Herbie
BENTT Michael
Knockout 7/12
London, United Kingdom
1993-10-29
BENTT Michael
MORRISON Tommy
Technical Knockout 1/12
Tulsa, USA
1993-08-30
MORRISON Tommy
TOMASHEK Tim
Technical Knockout 4/12
Kansas City, USA
1993-06-07
MORRISON Tommy
FOREMAN George
Unanimous Decision 12/12
Las Vegas, USA
Tommy Morrison captured vacant title after Michael Moorer decided not to defend the WBO heavyweight belt and relinquished the title.
1992-05-15
MOORER Michael
COOPER Bert
Technical Knockout 5/12
Atlantic City, USA
Michael Moorer won vacant title after Ray Mercer was stripped of the WBO belt to fight a 1992 elimination bout with Larry Holmes.
1991-10-18
MERCER Ray
MORRISON Tommy
Technical Knockout 5/12
Atlantic City, USA
1991-01-11
MERCER Ray
DAMIANI Francesco
Knockout 9/12
Atlantic City, USA
1989-12-16
DAMIANI Francesco
NETO Daniel Eduardo
Technical Knockout 2/12
Cesena, Italy
1989-05-06
DAMIANI Francesco
DUPLOOY Johnny
Knockout 3/12
Syracuse, Italy