International Boxing Federation (IBF) Junior Bantamweight Champion Luis Perez (23-1, 15 KOs) will square off against mandatory challenger and No. 1-ranked IBF contender Dimitri Kirillov (28-2, 10 KOs) in the new co-featured bout on Showtime Championship Boxing’s world title doubleheader on Saturday, May 6, (9 p.m. ET/PT). [details]