Undefeated middleweight contender  Khamzat Chimaev responded to allegations made by  Paulo Costa and denied sending the Brazilian’s wife DMs.  Following his UFC 318 win over  Roman Kopylov , Costa took aim at Chimaev in his  post-fight interview .  “Everybody knows that I hate that guy. Everybody knows who. That motherf***er Khamzat Chimaev.