Muhammad Ali's MMA fighting grandson has talked up his desire to continue the legacy of 'The Greatest' after signing for the Professional Fighters League [PFL].Biaggio Ali Walsh, 24, will compete in the organisation's tournament finals event in November, with the location to be confirmed. The former college football star will be competing for a winning prize of £865,000, potentially career-changing for an amateur, before going pro next year.Ali himself is considered one of the most legendary boxing figures in history, and the sport's first global star.