UFC lightweight Joel Alvarez has found much success inside the promotion’s cage. It’s just been difficult for him to get in there. For undisclosed reasons, Alvarez (20-3 MMA, 5-2 UFC) is out of his UFC on ESPN 55  bout opposite Mateusz Rebecki (19-1 MMA, 3-0 UFC) that was expected to take place on the April 27 main card at the UFC Apex in Las Vegas. Two people with knowledge of the situation recently informed MMA Junkie of the change but asked to remain anonymous because the promotion has yet to make an official announcement. Alvarez has withdrawn from three of his most recent four UFC bookings. Visa issues have been a problem for Alvarez throughout the years