With Bernd Leno being taken off injured during the first half of Arsenal's defeat to Brighton &amp; Hove Albion on 20 June 2020, Martínez came off the bench to make his first Premier League appearance since the 2016–17 season. This led to Martínez seeing out the season as first choice goalkeeper at the club and was highly commended for a string of stellar performances, with former Arsenal striker Ian Wright describing him as "commanding" and as having played "brilliantly" during his extended spell in the team. On 1 August, Martínez was selected to start in the FA Cup Final against Chelsea, he went on to make some crucial saves to help Arsenal win their 14th FA Cup; after lifting the trophy he was visibly emotional and reduced to tears.