In 2011, Nicholls began his wrestling career where he began wrestling for promotions such as Pro Wrestling Guerilla, NWA Pro, and World League Wrestling. After wrestling for a decade, he signed with Noah. Nicholls had the best years of his career in Noah, where he won several championships and frequently performed high-caliber matches.
In March, Nicholls signed with the company and began working with NXT. During his time with the company, his name was changed to Nick Miller, and formed a team with Shane Thorne called TM-61. At TakeOver Toronto, TM-61 lost to The Authors of Pain in the final round of Dusty Rhodes Tag Team Classic. In 2018, the team returned and repackaged as The Mighty. They entered the Dusty Rhodes Tag Team Classic but lost. In December, they released Nicholls from the company.
In 2019, Nicholls announced his return to NJPW and aligned with Chaos. In 2019, he entered the New Japan Cup but lost. At NJPW Southern Showdown, the team of Juice Robinson and Nicholls were unsuccessful in defeating Guerrillas of Destiny for the IWGP Tag Team Championship.