On 5 December 2017, he was announced as the Austrian representative in the Eurovision Song Contest 2018. He sang "Nobody but You". The song is composed by Sampson himself as well as Boris Milanov and Sebastian Arman, who have been involved in the composition of a number of songs for Bulgaria. He went on to win the jury vote with 271 points, but finished third overall, after taking into account the televoting where he ranked 13th with 71 points, thus preserving him the third overall position, with the public vote favouring Israel as the winner and Cyprus as the runner-up. This was the third highest ranking of all Austrian entries after its two Eurovision winning songs, first in Eurovision 1966 with "Merci, Chérie" by Udo Jürgens and 48 years later in Eurovision 2014 with "Rise like a Phoenix" with Conchita Wurst. Later that year, he appeared as a guest star in the Christmas edition of the Spanish TV program "Operación Triunfo."