González defended the title two times before losing the belt to Guts Ishimatsu on April 11, 1974, via KO in the 8 round. Later in the year he rematched Ishimatsu, but lost via TKO and retired from boxing.
González defended his title twice before losing it to Ishimatsu, who won via knockout in the eighth round on April 11, 1974.  He then fought Ishimatsu again but lost by technical knockout and retired from boxing.