A big lightweight division fight has been added to this May’s Strikeforce event as Gesias Cavalcante battles Isaac Vallie-Flagg. Cavalcante has not competed in a little more than nine months, last defeating Bobby Green at Strikeforce: Fedor vs. Henderson. Vallie-Flagg has won ten straight fights heading into this one, but this fight will be the biggest of his career. Strikeforce Heavyweight Grand Prix Finale takes place on May 19th at the HP Pavilion in San Jose, California and it is headlined by Josh Barnett versus Daniel Cormier.