Bergman I think was the last Southpaw.
Just looked up on Boxrec for their Heavyweight Rankings.
1. Usyk
2. Joshua
3. Parker
4. Fury
5. Dubois
https://boxrec.com/en/ratings?r%5Brole%5D=box-pro&r%5Bsex%5D=M&r%5Bstatus%5D=a&r%5Bdivision%5D=Heavyweight&r%5Bcountry%5D=&r_go=
Just looked up on Boxrec for their Heavyweight Rankings.
1. Usyk
2. Joshua
3. Parker
4. Fury
5. Dubois
https://boxrec.com/en/ratings?r%5Brole%5D=box-pro&r%5Bsex%5D=M&r%5Bstatus%5D=a&r%5Bdivision%5D=Heavyweight&r%5Bcountry%5D=&r_go=