Dominik Koepfer defeated Reilly Opelka 6–4, 6–4, 7–6(2) in the quarterfinals of the Dallas ATP Challenger on hard court. The German player's composed performance across all three sets secured a straight-sets victory, with the final set decided in a tiebreak where Koepfer's superior control proved decisive. The win represented a significant scalp for Koepfer at Challenger level, demonstrating his ability to neutralise Opelka's serve-based game through consistent baseline play. This result advanced Koepfer further into the Dallas draw and underlined his growing credentials on the North American hard-court circuit.