On Saturday, April 13th on Showtime undefeated boxers Claressa Shields and Christina Hammer will meet for the undisputed Middleweight Championship of the World! Last Friday's fights on Shobox were headlined by an excellent performance by Super Featherweight Xavier Martinez as well as Angelo Leo and Andres Cortes wins. One of the top pound for pound fighters Vasyl Lomachenko is back in action this weekend and Cruiserweight Champion Oleksandr Usyk announces his first fight at Heavyweight.