Melendez is returning from a year’s suspension after testing positive for performance enhancing drugs. He lost a split-decision to Eddie Alvarez at UFC 188.
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The fight was revealed by UFC reporter Megan Olivi on the FOX show UFC Tonight.
Olivi also reported Anthony Johnson vs Glover Teixeira and Holly Holm vs Valentina Shevchenkois are being worked on for the card, while TJ Dillashaw vs Raphael Assuncao being looked at for UFC 200.
The current card for UFC on FOX 20 is:
Alex Oliveira vs James Moontasri
George Sullivan vs Hector Urbina
Ryan LaFlare vs Alexander Yakovlev
Luis Henrique vs Dmitry Smolyakov
Edson Barboza vs Gilbert Melendez