Golota - Bowe I, Holyfield - Bowe I, Morales - Barrera I, Michaelczewski - Rocchigianni I. Plus some blatant robberies, Sturm - Dlh, Schulz - Foreman etc.
Marquez-Pacquiao 1, 2, and 3, Herrera-Garcia, Matthysse-Garcia, Morales-Maidana, Morales-Garcia 1, Lara-Williams, Spinks-Taylor, Wright-Vargas, and most famously, or infamously, Whitaker-Chavez
Duran's fight with Hagler was very close and impressive for a former lightweight. Whitaker's loss to De La Hoya was unconvincing and probably should have gone the other way, just like his draw with Chavez.
Generally speaking; when a significantly lesser fighter manages to trouble and remain competitive with a much greater fighter...