Tiago Cacao defeated Yannick Mertens 6-3 4-6 6-4 in the Portugal F1 semi-final on hard. The upset overturned the form book — Yannick Mertens came in leading the head-to-head 1–0, but Tiago Cacao had been the form player, winning 5 of their last 8 on hard. Tiago Cacao claimed a first win over Yannick Mertens in two meetings, narrowing the head-to-head to 1–1.
Cacao T. came through in three sets.