Due to his unique situation, MLB declared Loux a free agent, and he signed with the Texas Rangers.

[2] After his senior season at Stratford, he participated in a scouting combine and all-star games sponsored by the Houston Area Baseball Coaches Association.

[8][11][12] He was also named a semifinalist for the Golden Spikes Award, given to the top amateur baseball player in the United States.

[14] However, Loux failed his physical with the Diamondbacks due to a torn labrum and elbow damage that doctors felt might require ligament replacement surgery in the future.

[16] Though unsigned draft picks typically cannot begin their professional careers until the next season, MLB declared Loux a free agent in an unprecedented move.

[20] In an attempt to prevent this situation from happening again, the new collective bargaining agreement negotiated that winter by MLB and the MLB Players Association added clauses that included mandatory physicals for all top 200 prospects prior to the draft, and a rule that makes all future draft picks who fail a physical and do not receive an offer of at least 40 percent of the assigned value for that pick are to become free agents, with the team facing a reduction in the amount of money they can spend on their draft picks.

[22] In 2012, with the Frisco RoughRiders of the Double–A Texas League, Loux began the season with a 9–0 record and 2.20 earned run average.

[22] After finishing the season with a 14–1 record, a 3.47 ERA and 100 strikeouts, Loux was named the Texas League Pitcher of the Year.