Victor Ortiz (*after being asked a question regarding Mayweather's friendship with Justin Bieber) is CALLING OUT Floyd Mayweather ... demanding a rematch with the champ and telling TMZ Sports he'll do it FOR FREE!
The 27-year-old former WBC Welterweight champ was out in Malibu this weekend for the 2014 Nautica Malibu Triathlon ... when he issued the challenge.
FYI -- the two fought in 2011 ... with Mayweather emerging victorious after tagging Ortiz in the chin while Victor was trying to apologize for a headbutt.
"He owes me a rematch," Oritz says ... "And it's a free one from me to him."
Ortiz adds, "Mayweather, whenever you say bro ... you're the one that's calling the shots. I can't."
This article provided to Doghouse Boxing by our good friends at TMZ.com. For much more Boxing news updates, visit the home page HERE at Doghouse Boxing. Also make sure to follow Doghouse Boxing's news wire