Devitt signed with WWE's NXT in 2014. He started using his current name. Bálor won the NXT Championship twice. He held the title the first time for 292 days. This was the longest time anyone had been champion until Adam Cole broke the record on 19 March 2020. During his time in NXT, Bálor became the first co-winner of the Dusty Rhodes Tag Team Classic. His partner was Samoa Joe. Shortly after going to the main roster, Bálor became the first wrestler in WWE history to win a world title at their first pay-per-view. He was the second Irish world champion in WWE (after Sheamus). Balor is the quickest wrestler in WWE history to win a world title at 27 days after joining the main roster. He became the first WWE Universal Champion at SummerSlam 2016. Bálor is also a two-time Intercontinental Champion and a one-time United States Champion.