Boxing legend Julio Cesar Chavez Sr. wasn't amused watching his son LOSE to Anderson Silva this weekend ... and he's now calling for JCC Jr. to hang up his gloves for good.
35-year-old Julio Jr. -- who's 52-6-1 a pro boxer -- lost to the MMA star on Saturday by split decision, despite the fact 46-year-old Silva hasn't had a pro boxing match in more than 15 years.
Not only did Julio miss weight for the fight, but he looked completely outclassed and out skilled -- shocking considering Julio was the WBC middleweight champ back in 2011.