LAS VEGAS (AP) -- Floyd Mayweather Jr. is returning to the ring.
The undefeated six-time world champion says on his Twitter feed Tuesday he will end a 16-month hiatus when he faces WBC welterweight champion Victor Ortiz on September 17.
Mayweather (41-0, 25 KOs) hasn't fought since a unanimous decision over Shane Mosley on May 1, 2010, and has repeatedly declined to accept a bout against WBO welterweight champ Manny Pacquiao -- a dream matchup many boxing fans are eager to witness.
Instead, it was Mosley who squared off with Pacquiao in May, losing to the Filipino star in a lopsided 12-round decision.
Ortiz (29-2-2, 22 KOs) is riding a six-match win streak, most recently defeating Andre Berto in April to claim the WBO crown.