Sebastian Ofner defeated Dominic Thiem 5–7, 6–4, 6–2 in the quarterfinals of the ATP 250 Astana event on hard court. Thiem, the pre-match favourite at 1.81 odds, faltered after taking the opening set, allowing Ofner to seize momentum and convert the upset. Ofner's improved court positioning and consistency in the second and third sets proved decisive, as Thiem struggled to maintain the intensity that had secured the first set. The Austrian's victory marks a significant scalp at this stage of the tournament and suggests improving form heading into the latter rounds.