Oliveira recently confirmed the booking following an initial report from Ag.Fight. UFC 303 takes place on June 29 at the T-Mobile Arena in Las Vegas and is headlined by a welterweight bout between Conor McGregor and Michael Chandler.
After earning a contract on Dana White's Contender Series this past September, Oliveira made a strong first impression in his Octagon debut when he authored a flying knee knockout of Bernardo Sopai at UFC Fight Night 238 on March 2. The Brazilian has been victorius in nine of his last 10 professional appearances.
A veteran of 12 promotional appearances, Simon is coming off back-to-back losses to Yadong Song and Mario Bautista in UFC competition. Prior to that, Simon authored a five-bout winning streak in the Las Vegas-based organization.
Reference: https://www.sherdog.com/news/news/Vinicius-Oliveira-Ricky-Simon-to-Meet-at-UFC-303-on-June-29-193494