Matt Mitrione (0-0): The 6-foot-3, 275-pound 30-year-old was a two-position football All-American while in high school. After attending Purdue University and earning All-Big Ten honors, Mitrione played six seasons in the NFL as a member of the New York Giants and Minnesota Vikings. Following a devastating injury, Mitrione returned to his childhood passion of combat sports and began training with UFC veterans Chris Lytle and Jake O’Brien.

Roy Nelson (14-4): The 6-foot-1, 265-pound 33-year-old was born and raised in Las Vegas, training in martial arts from an early age while playing football, baseball and wrestling. After turning pro, Nelson surprised many opponents with his less-than-impressive physique. “Big Country” earned the now-defunct IFL’s heavyweight crown, before suffering recent losses to notables Jeff Monson and Andrei Arlovski.

Demico Rogers (4-0): The 6-foot-4, 235-pound 27-year-old was a stand-out wrestler and football player while attending high school in his native Washington. Rogers began training jiu-jitsu as a means of staying in shape, and after winning a local mixed martial arts tournament, he began to focus on the sport as a potential career.

Brendan Schaub (4-0): The 6-foot-4, 240-pound 26-year-old credits the Jean Claude Van Damme movie “Bloodsport” as his inspiration to pursue martial arts. Growing up in Colorado, Schaub was an all-state athlete in both football and lacrosse. Schaub went on to play fullback at the University of Colorado before later playing in the Arena Football League and earning a spot on the Buffalo Bills’ practice squad in the NFL. Schaub remained active in tae kwon do and jiu-jitsu, and he currently trains at T’s KO Fight Club and Jackson’s MMA.

Darill Schoonover (10-0): The 6-foot-2, 250-pound 24-year-old Schoonover grew up in Texas and began training in jiu-jitsu, judo and submission grappling at 17. After graduating high school, Schoonover entered the Army, serving two years in the armed forces. Schoonover remains on active reserve while pursuing a career in teaching, though with 10-stoppages wins in 10 trips to the cage, mixed martial arts may quickly take precedence.

Wes Shivers (3-1): The 6-foot-7, 285-pound 32-year-old Shivers was grew up in Mississippi, earning a scholarship to play football at Mississippi State University. Shivers earned all-SEC honors before playing in the NFL with both the Tennessee Titans and Atlanta Falcons. Shivers followed his football career with a four-year stint in law enforcement. Shivers continues to train in Mississippi, including with UFC veteran Alan Belcher.