With a strong wrestling pedigree as a fourth generation wrestler, David made his NJPW debut during the 2015 Best of the Super Jr. tournament, and entered the New Japan Dojo soon after. David Finlay’s NJPW journey would be defined by connections he made in that time; Jay White would become a rival he would be desperate to beat, while Juice Robinson would become a key ally with whom he won the 2019 World Tag League, and took the IWGP Tag Team Championships at Wrestle Kingdom 14. 

FinJuice would also win IMPACT tag gold in 2021 before Juice Robinson disbanded the team, joining BULLET CLUB shortly afterward. Angered at being looked past and left behind, Finlay would join his first G1 Climax in 2022 with a chip on his shoulder, and picked up huge wins over Shingo Takagi, Will Ospreay and his former partner Juice.