What are the best cases you can think of ? The conditions are that both fighters were genuinely world class, or somewhere along that level, so no Harry Greb vs Joe Cox, Mickey Walker vs Bearcat Wright, Barbados Joe Walcott vs Fred Russell or other similar cases. Only between 2 fighters that were both considered to be high level. The second condition is that the size difference was successfully overcame, and the smaller man came out the rightful winner or should have at least gotten the nod, in case of an unjust verdict. Have at it.