Futch or Arcel. Nacho Beristein maybe as well. He trained hall of famers mostly from the day they stepped in the gym: JMM, Rafa Marquez, Daniel Zaragoza, Gilbert Roman, Ricardo Lopez, Victor Rabanales, Chiquita Gonzalez, etc.
You'll never be able to name a no. 1 best. But in addition to those already mentioned Jack Blackburn, the man who trained Joe Louis, Charley Goldman, Marciano's trainer, and Harry Wiley, Ray Robinson's trainer, should be mentioned.
cus d'amato (don't forget jose torres and floyd patterson you idiots) Angelo mirena dundee (srl, ali, Luis Rodriguez, Willie Pastrano, Ralph Dupas, José Nápoles, Pinklon Thomas, Trevor Berbick, Jimmy Ellis, Wilfredo Gómez, Michael Nunn and Sugar Ramos) Richie Giaghetti (larry holmes, tyson for 6 fights, shavers, aaron pryor, cunningham ) Goody petronelli ( Hagler, steve collins) All 100% Italian. Deal with it.
Oh and I almost forgot, Lou Duva, another Italian. Evander Holyfield Pernell Whitaker Michael Moorer Arturo Gatti Meldrick Taylor Mark Breland Lennox Lewis Joey Giardello Rocky Lockridge Bobby Czyz Livingstone Bramble Johnny Bumphus Tony Tucker Mike McCallum Vinny Pazienza Darrin Van Horn John John Molina Eddie Hopson Hector Camacho Fernando Vargas
Charley Goldman Cus D'Amato Alcides Sagarra Nacho Beristáin / Arturo 'Cuyo' Hernández Amílcar Brusa Angelo Dundee Ray Arcel Eddie Futch Emanuel Steward