I have a real love and hate relationship with these kinds of threads. Once I take a peek inside I'm doomed. I work alone and in a big shop with lots of miles put on throughout the day so when I saw this earlier I grabbed pen and paper and went about my day. Five came fast and then another five and then another and so on. When I tried to narrow it down to five all time I honestly couldn't and believe me I tried. I changed my top 5 almost as many times as I added people to the list. So I compromised and broke it down into eras. For practical purposes based on decades. Some fellas overlap a bit.

2010-present

Gonzalez
Santa Cruz
Kovalev
Cotto
Garcia

Yesterday 2000-2010

Corrales
Vazquez
Morales
Mab
Hatton

Day before that. 1990-2000

Jones
Trinidad
Mosley
Jackson
Lopez

Last week. 1980-1990

Hearns
Arguello
Sanchez
Gomez
Qawi

Last month. 1970-1980

Napoles
Olivares
Arguello
Chacon
Zarate

Last year. 1960-1970

Saldivar
Chuvalo
Tiger
Foster
Jofre