Singleton was born in Pennsylvania and attended Penn Manor High School where he wrestled in the 285 lb weight division.
World Wrestling Entertainment (2012)
Florida Championship Wrestling/NXT (2012)
Singleton joined WWE's developmental promotion Florida Championship Wrestling, before it became solely known as WWE NXT as Adam Mercer during March 2012. At 19 years of age, Mercer was the youngest NXT member in the program's history. Despite his impressive physical credentials, Mercer wrestled a sparse series of matches, most of which were losses to notable up-in-coming wrestlers including Big E. Langston, Brad Maddox and Erick Rowan. Mercer's last FCW/NXT match was on August 1 in a losing fatal four-way tag match, teaming with Chad Baxter, against The Ascension (Conor O'Brian and Kenneth Cameron), Jason Jordan and Mike Dalton and Brad Maddox and Rick Victor.