Budapesti Atlétikai Klub, also known as BAK, is a Hungarian football club from the town of Budapest that competes in the BLSZ III.

In November 2018, the newly re-established BAK announced the rekindling of a friendship with the English amateur club Corinthian-Casuals FC, based on shared values and a history that goes back to the days when the original Corinthian Football Club visited Budapest to play a series of games in 1904.

They established a trophy called the Corinthian Cup, in which the original incarnation of BAK competed several times, and a visit of Corinthian-Casuals supporters and officials in November 2018 sparked the renewal of the friendship between the two clubs.

[6][5] BAK's friendship with Corinthian-Casuals led to the inauguration of a new international competition, called the Egri Erbstein Tournament, and designed to be an invitational event for like-minded, grass-roots football clubs from all over the world.

[7] The club announced that the first edition of the tournament would be held at the Szőnyi úti Stadion, in the Zugló district of Budapest, where BAK were originally based, in June 2019.