7 9 : ▁Nem esis ▁was ▁a ▁mixed ▁mart ial ▁arts ▁( M MA ) ▁event ▁held ▁by ▁the ▁Ult imate ▁Fight ing ▁Championship ▁( U FC ), ▁that ▁took ▁place ▁on ▁December ▁ 2 9 , ▁ 2 0 0 7 ▁at ▁the ▁Mand al ay ▁Bay ▁Events ▁Center ▁in ▁Las ▁Veg as , ▁Nev ada . ▁ ▁Background ▁The ▁main ▁events ▁featured ▁the ▁fight ▁between ▁Ch uck ▁L idd ell ▁and ▁W ander lei ▁Silva , ▁as ▁well ▁as ▁the ▁rub ber ▁match ▁between ▁former ▁U FC ▁Wel ter weight ▁Champions ▁Georges ▁St - Pierre ▁and ▁Matt ▁Hugh es ▁for ▁the ▁inter im ▁Wel ter weight ▁championship . ▁ ▁Additionally , ▁P ride ▁Light ▁He avy weight ▁R ame au ▁Th ier ry ▁S ok oud jou ▁made ▁his ▁U FC ▁debut ▁against ▁und efe ated ▁Ly oto ▁Mach ida . ▁ ▁The ▁main ▁event ▁was ▁originally ▁scheduled ▁to ▁have ▁The ▁Ult imate ▁F ighter ▁ 6 ▁coach es ▁Matt ▁Ser ra ▁and ▁Matt ▁Hugh es ▁for ▁Ser ra ' s ▁U FC ▁Wel ter weight ▁Championship , ▁which ▁Ser ra ▁won ▁at ▁U FC ▁ 6 9 : ▁Sho ot out ▁on ▁April ▁ 7 , ▁ 2 0 0 7 , ▁in ▁an ▁ups et ▁victory ▁over ▁Georges ▁St - Pierre . ▁ ▁Ser ra , ▁however , ▁with d rew ▁from ▁the ▁fight ▁due ▁to ▁a ▁back ▁injury , ▁Ser ra ▁was ▁replaced ▁by ▁St - Pierre , ▁though ▁the ▁fight ▁would ▁now ▁be ▁cont ested ▁for ▁the