João Faria, ranked 136th from Portugal, reaches the Mauthausen semi-finals on clay with mixed recent form. The Portuguese player has won three of his last five matches, including victories over Matteo Krumich and Andrea Guerrieri, though he suffered losses to Hubert Hurkacz and Roman Safiullin. Faria faces Darren Blanch in this semi-final clash with no prior head-to-head record between the two players. This marks Faria's first meeting with the American on the Mauthausen clay court.

Darren Blanch, ranked 244th from the USA, arrives at the Mauthausen semi-finals after a competitive run through the draw. The American has secured three wins in his last five outings, with notable victories over Henri Gaston and Juan Manuel Rodionov, balanced by losses to Benjamin Bonzi and Dmitry Glinka. Blanch and João Faria have never met in professional competition, making this semi-final encounter a first-time matchup on the clay courts of Mauthausen.