Gargano made some appearances for WWE early in his career. In June 2015, he took part in the company's tryout camp. After that, he began appearing regularly for NXT. He signed a contract with the company in April 2016 and formed a tag team called #DIY with Tommaso Ciampa. They held the NXT Tag Team Championship once. The team later ended and they often fought each other. In January 2019, Gargano won the NXT North American Championship. He won the NXT Championship in April the same year. In 2020, Gargano won the NXT North American Championship for a second time. He later won it for a third time. He is the first person to win it more than once. He left WWE after his contract ended in December 2021, but returned in August 2022. He and Ciampa reformed #DIY in October 2023. They went on to win the WWE Tag Team Championship twice.
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