He also posted a picture of himself with Pacquiao at an event in Japan.
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The pair first fought in a much-hyped match three years ago, when the unbeaten Mayweather came out on top. The Philippines’ Pacquiao has been chasing a new fight ever since.
One of the wealthiest sportsmen ever, Mayweather, 41, retired from the ring after his victory over Conor McGregor a year ago.
In the Instagram video, Mayweather said: “I’m coming back in December.”
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