STRIKEFORCE World Welterweight (170 pounds) Champion Nick Diaz (23-7, 1 NC) will make his second title defense when he faces Brazilian powerhouse Evangelista Cyborg (18-13) in main event action and STRIKEFORCE World Middleweight (185 pounds) Champion Jacare Souza (13-2, 1 NC) will put his belt on the line for the first time when he squares off with power-punching knockout artist “Ruthless” Robbie Lawler (18-6, 1 NC) in the co-main event of a stacked Mixed Martial Arts (MMA) fight card at HP Pavilion in San Jose, Calif.