Fighters whose defining moment(s) were in defeat?

[Zilla]

Foreman to Ali
Tyson to Douglas
Holyfield to Bowe
Oscar to Tito
Gatti to Ward I
Judah to Tszyu
Tarver to Jones
Ruiz to Tua
Hearns to Leonard
Khan to Prescott

Tarver to Jones? Really? Tarver had lost before Jones and in the rematch he smoked Roy. I wouldn't call that a defining loss. The Tyson-Douglas one, either. Mike was lazy, I would say a defining loss came when a fighter did everything he could do and acquitted himself well. Mike did a tenth of what he could do and got swatted like a fly.