What are some examples of someone who is dominated in the first fight, then wins in a dominate fashion in the rematch? Has something happened like if Frazier were to have won the second fight with Foreman?
The Pacquiao-Morales trilogy. The first fight between the two isn't a particularly close one, when you consider that Morales still won an easy decision after gift wrapping Manny the 12th. I STILL scored it 8-4 for Morales, and had he fought that final round seriously, he'd have likely wound up with that margin in the official win. In the rematch, Manny started fast, Erik responded well, and then Manny blitzed him in the 6th. Spent the remainder of the fight dominanting him, beating him up, and then conclusively stopping him in the 10th. Morales won 2-3 rounds in the rematch, tops. And then, in their rubber match, he was manhandled and stopped in three. Oscar Larious came back to dominate Israel Vasquez in their second fight and stopped him, after getting knocked cold in the first meeting, in the first round. He lost the rubber match via cuts and did hit the canvas, but was not getting dominated, so I still think this applies.
A bit out of left field; but what about Henry Maske coming out of a decade's retirement to gain revenge over Virgil Hill?
Rocky Graziano's return-bout TKO of Tony Zale has always meant the most to me, eg. Rocky was a grown-up Pied Piper; a local guy we all followed to Stillman's Gym. We adored him.
Terry Norris over Simon Brown fits the bill. Prett brutal ko loss to overcome and lots of folks jumped off the Norris bandwagon after that defeat. The feeling was he was a shot fighter or damaged goods. Then the rematch saw him put on an absolute 12 round clinic on Simon.
Joltin' Jeff Chandler vs Oscar Muniz As much as I hate to say it....Carlos Ortiz vs Ismael Laguna Azumah Nelson vs Jeff Fenech Hopkins vs Prime RJJ
Ketchel-Papke takes the cake here. Ketchel totally dominates the first fight, doesn't lose a round. In the rematch, Papke adjusts and puts one of the most savage beatings in all of ring history on Ketchel and doesn't lose a round. In the third fight, Ketchel adjusts and puts on of the most savage beatings in all of ring history on Papke. People at the time, they thought Ketchel was finished after the thrashing he took from Papke. They thought he was done. It's all in the game now but on the huge and violent swings in dominance in those first three fights has never even come close to being matched.