Julio Cesar Chavez Jr. Home Burglarized, Thieves Jack $750k In Valuables

Boxing star Julio Cesar Chavez Jr. claims burglars ransacked his L.A. home -- taking roughly $750k in jewelry and other valuables, TMZ Sports has learned. 34-year-old Chavez -- son of boxing legend Julio Cesar Chavez Sr. -- believes the burglary…