A pair of welterweight fighters have agreed to fight at this May’s Strikeforce event as Naj-Shon Burrell collides with Bobby Voelker. Burrell has been undefeated in Strikeforce competition, winning all three of his fights thus far in the promotion. Voelker has won four of five in the promotion, competing in an epic three fight trilogy with Roger Bowling in three of those fights. Strikeforce Heavyweight Grand Prix Final takes place on May 19th at the HP Pavilion and it is headlined by Josh Barnett versus Daniel Cormier.