A middleweight bout between Joey Villasenor and Evangelista “Cyborg” Santos will serve as the main event for the second installment of SHO MMA: Strikeforce Challenger Series. The event takes place on June 19 in Kent, Washington.

Villasenor (26-6), is riding a three-fight win streak, but has been idle since defeating Phil Baroni at EliteXC: "Primetime" nearly a year ago. The KOTC veteran was originally supposed to rematch EliteXC middleweight champion Robbie Lawler last November, however the promotion met its demise before he could the fight came to fruition.

Villasenor is one of the 42 fighter contracts acquired by Strikeforce from ProElite.

Evangelista “Cyborg” Santos (16-12) recently signed with Strikeforce but hasn't fared too well as of late, going just 1-3 in his past four fights. Santos last fought at Sengoku: Fifth Battle in September 2008, where he suffered a loss to Siyar Bahadurzada.

ShoMMA's “Series 2″ will also feature a lightweight bout between UFC veteran Jorge Gurgel and EliteXC veteran Conor Heun. Middleweight prospect Cory Devela and Dennis Hallman have also been confirmed for the event.