I will say Trinidad - De la Hoya as well. Even though I am the rare fan of both.

De la Hoya Mayweather is a close seccond given that it was the highest grossing fight in history and I never even bothered to see it again after the first time. I usually see a big fight at least 3 times. Heck, I must have seen Trinidad - De la Hoya 30 times.

See the thing is Trinidad - De la Hoya was a rare thing. Two champions, both undefeated, both stars in their own right. There was no doubt that the two men meeting that night were the two best welterweights. Odds split right down the middle. De la Hoya was a slight favorite but most agreed it was a toss up. And both guys were known to be exciting power punchers with really high KO percentages. No one ever expected DLH to do what he did. Never had he fought that way before or since. And what made it worst is he didn't follow through and lossed it.

Add to that the fact that a rematch was never made and this will probably go down as the biggest disappointment in boxing history.