Fights of undefeated HW-champions

[jiopsi]

1. Ali - Frazier
2. Tyson - Tucker
3. Tyson - Spinks
...

More after Tyson Spinks?

EDIT: no, these are the only fights

1971 (31-0 WBA) Ali - Frazier (26-0 WBA/WBC), Frazier UD15
1987 (30-0 WBA/WBC) Tyson - Tucker (34-0 IBF), Tyson UD12
1988 (34-0 WBA/WBC/IBF) Tyson - Spinks (31-0 IBF), Tyson KO1

[Mr.MojoRisin']

1. Ali - Frazier
2. Tyson - Tucker
3. Tyson - Spinks
...

More after Tyson Spinks?

What is the subject of this thread supposed to be?

[rightsideup]

not really sure if he is rating the quality of those fights or the time placement of each

[The Old LefHook]

Were the opponents in each match undefeated up to that point?

[rightsideup]

Were the opponents in each match undefeated up to that point?

yes but in the first one both were undefeated and held the undisputed title

[Clegg]

Just unification/lineal fights or does something like Martin-Glazkov count?

[jiopsi]

Just unification/lineal fights or does something like Martin-Glazkov count?

Undefeated world champions.

Neither of those were world champions onto that fight, only regional champions I think.

[jiopsi]

Checked WBC, WBA, IBF and WBO through and there's no more such fights.

So these are the fights:

1971 (31-0 WBA) Ali - Frazier (26-0 WBA/WBC), Frazier UD15
1987 (30-0 WBA/WBC) Tyson - Tucker (34-0 IBF), Tyson UD12
1988 (34-0 WBA/WBC/IBF) Tyson - Spinks (31-0 IBF), Tyson KO1