[16] The first encounter of the teams, officially is on 1 October 1921 during 1921 Malaya Cup final where Singapore defeated Selangor with scoreline 2-1.

Unofficially, there is a record of friendlies named 'Classics' from 1901 till 1913 between these two teams, with Singapore winning its first edition.

[17] During the pre-war years, Singapore and Selangor FA were a dominant force and fierce rivals, winning the Cup 19 times between them.

The rivalries ended when Singapore pulled out from Malaysian League in 1994 due to dispute with Football Association of Malaysia (FAM) about ticketing issue.

However, the squad were the country under 23 team and bound to several specialty (will not have to face relegation and unable to recruit foreign players).