Well there's no Mayweather on March 13 but there will be Joshua Clottey. After the Very controversial agreements between Manny Pacquiao and Floyd Mayweather Jr. regarding the blood testing issue, Team Pacquiao didn't agree to the demand of Mayweather that's why Team Pacquiao has moved on. Until it came to "Pacquiao Vs Clottey".
Here is the Tale of the Tape: