Unbeaten Natividad Tests Loud in Flyweight Headliner as Five Contracts Hang in Vegas

The UFC's prospect mill fires up again Tuesday night at the Meta APEX, and Dana White's got five blank contracts burning a hole in his pocket. The Contender Series returns with a main card stacked with undefeateds and hungry vets looking to punch their ticket to the big show. Colton Loud and Christian Natividad…