George Foreman vs. Gregorio Peralta 1 (Foreman wins close decision) George Foreman vs. Gregorio Peralta 2 (Foreman stops Peralta in 10) Earnie Shavers vs. Henry Clark 1 (Shavers wins close decision) Earnie Shavers vs. Henry Clark 2 (Shavers stops Clark in 2) Mike Weaver vs. Stan Ward 1 (Ward decisions Weaver over 12) Mike Weaver vs. Stan Ward 2 (Weaver stops Ward in 9) Mike Weaver vs. Stan Ward 3 (Weaver stops Ward in 9 again) Greg Page vs. Mark Wills 1 (Wills upsets Page, stops him in 9) Greg Page vs. Mark Wills 2 (Wills stops Page in 6) Tim Witherspoon vs. Bonecrusher Smith 1 (Witherspoon decisions Smith) Tim Witherspoon vs. Bonecrusher Smith 2 (Smith stops Spoon in 1)
If puncher ruins boxer in first fight then wins rematch quicker. Although not completely ruined, a good example: Pacquiao vs Morales
Normally boxer does better in the rematches, because they normally have more tools to work with to adapt better.