AMIR KHAN wants a showdown with Floyd Mayweather before the pound-for-pound king calls it a day.
Bolton boxer Khan was ringside in Las Vegas last weekend to see unbeaten Mayweather, 36, beat Robert Guerrero.
And he took to Twitter afterwards to talk up a clash with the WBC welterweight champ, who has now won 44 out of 44, including a demolition of Manchesterís Ricky Hatton in 2007.
Khan, 26, has unfinished business with Danny Garcia and Lamont Peterson, who inflicted two of the three defeats of his 31-fight career.
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