Stephen A. Smith and Vincent Goodwill share their thoughts on Floyd Mayweather Jr. and Manny Pacquiao's rematch. (1:22) The rematch between boxing legends Floyd Mayweather and Manny Pacquiao is apparently in flux, according to Mayweather. Mayweather was slated to end his nearly decade-long retirement against Pacquiao on Sept. 19 at The Sphere in a rematch of their 2015 blockbuster fight. However, during a meet and greet at the MCM store inside Caesar's Palace on Saturday, Mayweather cast some doubt on the pending fight, telling Vegas Sports Today that it would actually be an exhibition and that it might not take place at The Sphere. "As of right now, we don't know exactly where the fight is going to be at," Mayweather said. "We don't know the location of the fight. The Sphere is one of the places that they talked about. So, we don't know if it's a hundred percent going to be there.…