On March 14, 2018, Martínez signed with the Chunichi Dragons on a developmental contract.[1] He spent the 2018 and 2019 seasons with Chunichi's farm team. On July 1, 2020, Martinez was given a full-time rostered deal and a new shirt number, 57.[2] Martínez notched 5 hits in 18 plate appearances for Chunichi in 2020.[3] The Cuban catcher Ariel Martinez shone again on Wednesday in Japanese baseball, when he hit a homer that led to the victory of the Chunichi Dragons over the Yakult Swallows. Playing left field, the versatile Martinez went 2-3, with a run scored and a walk, to leave his average at .333, and get the only run of the game, which ended 1-0 in favor of his team.[4] He became a free agent following the 2022 season.
Like most of the Cuban children from his generation, Ariel Martínez admires legendary Cuban catcher Ariel Pestano. One catcher that he likes to study and emulate his game off of is Kansas City Royals catcher Salvador Pérez. He tries to watch film of him often and he definitely enjoys catching plenty of Kansas City Royals games on television when he can.[6]