Two more former champions, Paul Malignaggi and Zab Judah, have also become notches on Khan's title belt.

WSJ: Boxing Braces for the Wrath of Amir Khan

The Bolton-born fighter is currently preparing for the defence of his WBA light-welterweight title against IBF champion Zab Judah on 23 July.

BBC: Amir Khan eyes Floyd Mayweather/Victor Ortiz winner

Showtime will broadcast championship boxing events on April 20, featuring Canelo Alvarez versus Austin Trout, and April 27 with a headline bout of Danny Garcia and Zab Judah.

FORBES: Showtime Kicks Off Floyd Mayweather Month With '30 Days In May'