Floyd unfazed by 'dirty' Conor

LOS ANGELES - Floyd Mayweather has accused Conor McGregor of "fighting dirty" in training but is confident of a clean battle when the two men meet in their August 26 superfight.

Mayweather said during a media conference call on Thursday that he believes mixed martial arts star McGregor has used illegal tactics in sparring sessions. The undefeated former welterweight king, who is coming out of retirement to fight McGregor in Las Vegas, said he had spotted rabbit punches in footage of McGregor's sparring session with Paulie Malignaggi.

McGregor, who has never fought in a professional boxing contest, appears to floor Malignaggi in the footage.