Andy Ruiz is one of three men to ever beat Anthony Joshua in the ring ... and he was kind enough to share some solid advice with Jake Paul ahead of his December 19 bout!!
Ruiz (35-2, 22 KOs) handed Joshua his first career loss in 2019, with a TKO in the 7th round of their main event at Madison Square Garden in New York City -- one of boxing's biggest upsets ever.
That said, we asked Ruiz -- who was distributing turkeys at the New Village Girls Academy Turkey Drive in Los Angeles this week -- if there were any suggestions he'd like to leave for the YouTuber-turned-boxer.