Shawne Merriman Challenges Batista To MMA Fight, I'll Be Ready!

[[tmz:video id="1_50hn7qin"]] Ex-NFL star Shawne Merriman wants to get in a cage and beat the living hell outta someone ... and that person??? It's wrestling superstar Batista. YES, Merriman wants to fight Dave Bautista ... the WWE legend turned…