Nicolás Sánchez Izquierdo of Spain enters the Ostrava semi-finals as the world number 293, seeking to extend his clay-court run in this tournament. The Spanish player has shown mixed form in recent matches, securing victories over Sachko and Mrva but suffering losses to Sakellaridis and Rodionov on clay. Sánchez Izquierdo has never faced Gentzsch previously, making this semi-final encounter a fresh matchup. His ability to convert break points and maintain consistency on clay will be crucial against the higher-ranked German opponent.

Tobias Gentzsch of Germany arrives at the Ostrava semi-finals ranked 228 in the world, holding a slight ranking advantage over his Spanish opponent. The German player has demonstrated stronger recent form, winning four of his last five matches including victories over Piros, Loffhagen, and Moro Canas on various surfaces. Gentzsch's recent campaign shows improved performances across multiple rounds, though he suffered a loss to Rocha in his tournament preparation. This will be Gentzsch's first career meeting against Sánchez Izquierdo as the semi-final pair prepares to contest the clay court at Ostrava.