Martín made his first-team debut on 19 September 2017, starting and making several key stops which included a penalty kick, in a 1–1 home draw against CD Numancia, for the season's Copa del Rey (1–3 loss on penalties).[3] Late in the month, he extended his contract until 2021 and being definitely promoted to the main squad for the following campaign.[4]
Martín made his league debut at RCD Mallorca, replacing injured Diego Mariño in a match were Sporting was defeated by 1–2 in extra time. He contributed with four league appearances during the campaign, acting mainly as a backup to Mariño.
On 18 July 2019, Martín joined La Liga side Real Betis on a five-year deal.[5] He made his debut in the Spanish top tier on 18 August, coming on as a first-half substitute for field player Joaquín in a 1–2 home loss against Real Valladolid, after Joel Robles was sent off.
Martín was mainly a backup to Joel during his first season, where he featured in eight matches overall, but was demoted to third-choice in his second after the arrival of Claudio Bravo. On 30 July 2021, after falling down further in the pecking order due to the arrival of Rui Silva, he moved to Málaga CF in the second division on a one-year loan deal.[6]
On 17 July 2023, Martín signed a two-year deal with FC Andorra in division two.[7] Roughly one year later, after suffering relegation, he agreed to a one-year contract with CD Eldense of the same category.[8]
Career statistics
Club
As of match played 19 July 2020
Appearances and goals by club, season and competition