All good mentions. For me, I’d top the list with Sweet Pea. I’ve never seen Tiger Flowers (does any exist) but he was very good, obviously.
Khaosai Galaxy, Bazooka Limon, Srisaket Sor Rungvisai, Edwin Valero, Takashi Miura, Vic Darchinyan, James Kirkland and Frank Fletcher were far more skilled than that caveman Michael Nunn.
On a serious note the only other southpaws I can think of that are as skilled or slightly more who haven't been mentioned yet are guys like Flash Elorde, Joe Calzaghe, Winky Wright, Ivan Calderon, Joel Casamayor, Jiro Watanabe, Hiroyuki Ebihara, Shakur Stevenson.
The 5ft 5ins natural WW Young Corbett III must have been pretty skilled to beat ATGs Mickey Walker and Jackie Fields, as well the much bigger ATG Billy Conn and borderline ATGs Gus Lesnevich and Fred Apostoli.
LOL way too many names thrown around here.I agree wih Hagler, Bud, Whitaker and Usyk. The rest is very much up for debate.
To name a few others : Khaosai and Khaokor Galaxy, Ratanapol Sor Vorapin, Jean-Baptiste Mendy, Yober Ortega, Yukonori Oguni (really inconsistent though), Toshiaki Nishioka, Juergen Braehmer, Salim Medjkoune, Ginjiro Shigeoka, Daniel Ponce De Leon, Cristian Mijares, Hilario Zapata.