Losses that initially look bad, but look much more respectable later on

Pac vs MAB the first fight a star was born when Pac TKO him in the 11th round.

What are some examples of losses where it looks bad at first because the opponent is a "bum" "subpar" etc, but that opponent goes on to have a much better career? For example, Robert Guerrero losing to Orlando Salido (yes, I know it was reversed to a NC, but it was a loss at the time), which looked bad at the time, but Orlando Salido went on to beat Juanma twice, thus making that loss for Guerrero look much more respectable. Same thing for Cotto vs Trout. Cotto was supposed to beat him, but if Trout goes on to have a great career, that loss doesn't look so bad in the long term. Sergio Martinez losing to Margarito comes to mind. Nelson-Sanchez, Sorjaturong-Lopez, Marquez-Austin. Not sure if that's what your asking for specifically.