Guerrero vs. Kamegai is a 12-round fight promoted by Golden Boy Promotions and sponsored by Corona and AT&T.  In the co-main event Gary Russell Jr. Faces Ukrainian star Vasyl Lomachenko in a 12-round showdown for the vacant WBO World Featherweight Title and in the opener Devon Alexander “The Great” will face off against Jesus Soto Karass in a 10-round super welterweight match up.  It will take place at Stubhub Center in Carson, Calif., and will air as the Showtime Championship Boxing® main event live on Showtime  (10 p.m. ET/7 p.m. PT) and will be available in Spanish via secondary audio programming (SAP).

“I’m excited to be making my ring return on June 21, especially for my fans in California,” said Guerrero, who last fought against Floyd Mayweather on May 4, 2013. “Although I've been out for a while, make no mistake about it, I’m in great shape.  I’m hungry and I’m looking forward to the challenge Kamegai presents.  I am just happy to be fighting again while bringing excitement to the hottest division in boxing, the welterweight division. I have no doubt that I will be victorious in my return.”

“The fans in Carson always demand the best fights possible, and we’ve got two more for them on June 21,” said Oscar De La Hoya, President of Golden Boy Promotions. “It’s great to have Robert Guerrero back in the ring where he belongs, and his fight with Kamegai is going to be action-packed from start to finish.  Also, Russell vs. Lomachenko is a fight fans have been asking for and looking forward to seeing for quite some time. Given what these two young men can do in the ring, it may not be the last time we see them fighting each other. Add in Alexander vs. Soto Karass, and this is another great card that I can’t wait to see.”