No Entourage, Just Hopes Of a Knockout; Landing Jabs to Pay Bills
Boxing has always been sport of immigrants, who see it as exit from ghetto life, according to Hank Kaplan, boxing historian; current wave of Mexican immigrants provide names for boxing cards at small clubs and converted ballrooms around New York, with Antonio Oliveros topping list; for Oliveros, club boxing provides money to make ends meet and help pay for his children's education; photo (M)
