Vinicius Oliveira pulled off an all-time knockout in his UFC debut and the performance has earned him a big-name opponent for his second promotional outing. “LokDog” will take on Ricky Simon in a three-round bantamweight bout at UFC 303 , the promotion’s June 29 pay-per-view event at T-Mobile Arena in Las Vegas. The card is headlined by Conor McGregor vs. Michael Chandler .