The song was performed by Aisel, who was internally selected by the Azerbaijani broadcaster İctimai Television (İTV) to represent the nation at the 2018 contest in Lisbon, Portugal.

Aisel's selection as the Azerbaijani Eurovision entrant was announced on 8 November 2017, while the song "X My Heart" was presented to the public on 4 March 2018.

Between 2011 and 2013, Azerbaijan organized a national final titled Milli Seçim Turu to select the performer, song or both for Eurovision.

In 2014, the broadcaster utilised an existing talent show format titled Böyük Səhnə where the winning performer would subsequently be given an internally selected song.

The selection of the song was based on the decision of İTV and participants of an opinion survey that featured 300 music and television industry experts as well as Eurovision fans from 31 European countries; "X My Heart" received the most positive votes among three shortlisted entries with 87%.

[6] "X My Heart" was written by Dimitris Kontopoulos and Sandra Bjurman, and was presented on 4 March 2018 via the streaming service provider Spotify.

On 7 April, Aisel performed during the Eurovision Pre-Party, which was held at the VEGAS Kuntsevo shopping mall in Moscow, Russia.

The four backing vocalists/dancers that joined Aisel on stage were Hugo Baptista, Rui Andrade, Salomé Caldeira and Sandra d'Andrade.

This marked the first time that Azerbaijani failed to qualify to the final of the Eurovision Song Contest from a semi-final since its first entry in 2008.

Each nation's jury consisted of five music industry professionals who are citizens of the country they represent, with their names published before the contest to ensure transparency.

This jury judged each entry based on: vocal capacity; the stage performance; the song's composition and originality; and the overall impression by the act.