Ahead of his upcoming UFC 279 headliner this weekend against Nate Diaz, undefeated welterweight contender, Khamzat Chimaev has claimed he is “motivated” by the prospect of earning his first substantial payday in professional mixed martial arts with a victory in ‘Sin City’. Chimaev, the current #3 ranked welterweight contender, featured on the main card of UFC 273 back in April of this year most recently – defeating one-time title chaser, Gilbert Burns with a close, unanimous decision victory. As for Diaz, the Stockton veteran has been sidelined since June of last year at UFC 263, suffering a unanimous decision loss…