Undefeated boxing star Floyd Mayweather will fight “Dangerous” Don Moore in a rearranged exhibition bout in Abu Dhabi on Saturday, organisers said on Friday. The former welterweight world champion, who retired with an unbeaten 50-0 record, was preparing to fight Moore last week before the United Arab Emirates went into mourning for the death of president Sheikh Khalifa. Mayweather, 45, and fellow American Moore — who is also undefeated but retired in 2016 — will fight in the UAE capital’s Etihad Arena with Brazilian MMA great Anderson Silva facing the UAE’s Bruno Machado on the undercard. It…