A few that come to mind for me:

1. Foreman vs Michael Moorer
2. Wladimir vs Lamont Brewster 1
3. James Toney vs Michael Nunn
4. Cotto vs Margarito
5. Kennedy McKinney vs Barrera
6. Pavilik/Froch vs Jermain Taylor

Chavez vs Taylor was a great example and the one I immediately thought of.