World light-middleweight champion Floyd Mayweather has asked fans to decide whether his next fight should be against Amir Khan or Marcos Maidana.
Briton Khan signed a deal in December that put him in line for a possible bout with the unbeaten Mayweather.
Khan, 27, has won 28 of his 31 fights, while 30-year-old Argentine Maidana has 35 victories from his 38 bouts.
Mayweather, 36, tweeted: "I'm going to let the fans vote. Tell me who I should fight next. Khan or Maidana?"
beat Saul Alvarez
in September 2013 in the most recent of his 45 career fights.
Khan beat Maidana in Las Vegas in December 2010
on a unanimous points decision, with his last fight a dramatic
points victory over Julio Diaz
in Sheffield in April 2013.