Dominic Thiem defeated Maximilian Marterer 6–1, 6–7, 6–4 in the first round of the ATP 250 event at Estoril on clay on 1 April 2024, confirming his status as the pre-match favourite with odds of 1.69 to Marterer's 2.26. After dominating the opening set, Thiem faced resistance in the second, where Marterer forced a tie-break and claimed it to level the match. The Austrian regrouped in the decider, securing the break of serve necessary to close out victory in two hours and advance. The result underscores Thiem's continued comfort on clay surfaces and suggests positive momentum heading into the latter stages of the spring clay season.