Romit Safiullin, ranked 226 globally, reaches the Oeiras 3 semi-finals on clay with strong recent form. The Russian has won four of his last five matches, including straight-set victories over Ludovic van Assche, Tommaso Torres, and João Domingues Silva. Safiullin faces an unseeded first meeting against higher-ranked opposition in this semi-final encounter.

Henrique Rocha, ranked 126 and representing Portugal, enters the Oeiras 3 semi-finals as the seeded favourite on home clay. The Portuguese player has compiled an impressive 4-1 record in his last five matches, with four straight-set wins offset only by a straight-set loss to Mariano Trungelliti. Rocha's recent victories include wins over Renzo Sakamoto, Thomas Gentzsch, and Nicolas Budkov Kjaer on the same surface.