What fights changed a fighters career,even if they won?

[4Corners]

Ali-Frazier III. Ali had NOTHING left after that. He faded at a terribly high rate after that fight. That's when Ali should have retired.

[ninerdude90]

Even though he won the trilogy, Riddick Bowe was never the same fighter after he shared the ring with Evander Holyfield. He was basically shot after those fights, at the ripe old age of what...28?

[RIZO24]

The Paul Williams VS Sergio Martinez II. After that KO Williams will never be the same as before.. Mosely VS MArgarito fight, MArgs was never the same after that beating..

[J-Smooth]

pac - DLH. pac was already a star within the boxing community but when he kicked oscars ass his career went mainstream