For his entry into the competition on Spanish clay, the young Dane had already encountered difficulties: he only came out after almost three hours 5-7, 7-6 (7/2), 6- 4 against Argentinian Mariano Navone (41st).
Rune, however, remained in a semi-final in Munich (Germany), beaten by the future winner, Jan-Lennard Struff, and a quarter-final in Monte-Carlo, beaten by Jannik Sinner.