A big lightweight division bout is set to co-headline UFC 188 as Gilbert Melendez will duke it out with Eddie Alvarez. Melendez will be competing for the first time since losing to UFC Lightweight Champion Anthony Pettis at UFC 181. Alvarez is currently winless in UFC competition, but he is the former Bellator MMA Lightweight Champion. UFC 188 takes place on June 13th from the Mexico City Arena in Mexico City, Mexico with Cain Velasquez and Fabricio Werdum headlining.