Should there be a re-match clause in the Pac vs. Mayweather fight or should the rivalry be settled in 1 fight?

A rematch would be good for the sport but then it will just give fans a chance to make more excuses as to why the fighter loses. I'm for Mayweather and if he were to lose convincingly then it is what it is. If not then there should be a rematch. Same for Pacquiao if he isn't beaten convincingly then he should get a rematch too. Sometimes a fighter doesn't have a good night and there's always another fight to prove their skills