Junior Cesar Chavez

Jake Paul's got his next opponent lined up -- it's former WBC middleweight champ Julio Cesar Chavez Jr. ... the son of boxing legend Julio Cesar Chavez. El Gallo shared the big news on Friday ... saying the bout is going down at the Honda Center in Anaheim on June 28. The match between 28-year-old…

Legendary boxer Julio Cesar Chavez -- arguably the greatest Mexican fighter of all time -- is now officially a grandfather ... 'cause his son Julio Cesar Chavez Jr. just had a baby girl, TMZ Sports has learned. We've obtained a birth certificate for Julia Chavez ... who was born at Cedars-Sinai…