Floyd Mayweather Jr., left, trades blows with Marcos Maidana, from Argentina, in their WBC-WBA welterweight title boxing fight Saturday, May 3, 2014, in Las Vegas. (AP Photo/Isaac Brekken)
Marcos Maidana, left, from Argentina, drives Floyd Mayweather Jr. against the ropes in their WBC-WBA welterweight title boxing fight Saturday, May 3, 2014, in Las Vegas. (AP Photo/Eric Jamison)
Floyd Mayweather Jr., right, is tended to in his corner during his WBC-WBA welterweight title boxing fight against Marcos Maidana Saturday, May 3, 2014, in Las Vegas. (AP Photo/Isaac Brekken)
Marcos Maidana, left, from Argentina, trades punches with Floyd Mayweather Jr. in their WBC-WBA welterweight title boxing fight Saturday, May 3, 2014, in Las Vegas. (AP Photo/Isaac Brekken)
Marcos Maidana, left, from Argentina, throws a left at the head of Floyd Mayweather Jr. in their WBC-WBA welterweight title boxing fight Saturday, May 3, 2014, in Las Vegas. (AP Photo/Isaac Brekken)
Marcos Maidana, left, from Argentina, trades blows with Floyd Mayweather Jr. in their WBC-WBA welterweight title boxing fight Saturday, May 3, 2014, in Las Vegas. (AP Photo/Isaac Brekken)
Floyd Mayweather Jr., right, connects with a right to the head of Marcos Maidana, from Argentina, in their WBC-WBA welterweight title boxing fight Saturday, May 3, 2014, in Las Vegas. (AP Photo/Eric Jamison)
Floyd Mayweather Jr., right, trades punches with Marcos Maidana, from Argentina, in their WBC-WBA welterweight title boxing fight Saturday, May 3, 2014, in Las Vegas. (AP Photo/Eric Jamison)
Floyd Mayweather Jr. sits in his corner during his WBC-WBA welterweight title boxing fight against Marcos Maidana Saturday, May 3, 2014, in Las Vegas. (AP Photo/Eric Jamison)
Floyd Mayweather Jr., right, connects with a right to the head of Marcos Maidana, from Argentina, in their WBC-WBA welterweight title boxing fight Saturday, May 3, 2014, in Las Vegas. (AP Photo/Isaac Brekken)
Marcos Maidana, center, from Argentina, knocks Floyd Mayweather Jr. through the ropes in their WBC-WBA welterweight title boxing fight Saturday, May 3, 2014, in Las Vegas. At left is referee Tony Weeks. (AP Photo/Eric Jamison)
A member of his corner flashes a victory sign as Floyd Mayweather Jr. reacts at the end of his WBC-WBA welterweight title boxing fight against Marcos Maidana Saturday, May 3, 2014, in Las Vegas. Mayweather won the bout by majority decision. (AP Photo/Isaac Brekken)