Watch Floyd Mayweather put his perfect record on the line against Marcos Maidana in this welterweight unification bout, plus Amir Khan's anticipated return to the ring versus Luis Collazo. Don't miss the Showtime premiere of Mayweather vs. Maidana Saturday, May 10 at 9:30PM ET/PT. More on Mayweather vs. Maidana: http://s.sho.com/1eRd3ca @SHOsports on Twitter: http://s.sho.com/1mhwzUy Don't Have Showtime? Order Now: http://s.sho.com/P0DCVU Watch on Showtime Anytime: http://s.sho.com/NTF3EI