Dusan Lajovic defeated Ugo Humbert 6–4, 6–4 at the ATP 250 Barcelona tournament on clay in the first round, delivering an upset victory against the pre-match favourite. Humbert entered as the odds-on favourite at 1.53, but Lajovic's composed performance on the surface proved decisive, with the Serbian player securing both sets by identical scorelines. The result represents a notable scalp for Lajovic, who managed to neutralise Humbert's strengths and maintain control throughout the encounter. The victory sends Lajovic into the second round with momentum on clay, whilst Humbert's tournament hopes end at the opening hurdle in what constitutes a significant early exit.