Flavio Cobolli will play fellow Italian Matteo Arnaldi on Friday in the French Open semifinals.
Tenth-seeded Cobolli beat Felix Auger-Aliassime 4-6, 6-4, 6-4, 6-4 on Wednesday, and Arnaldi advanced when Matteo Berrettini, yet another Italian, retired because of an injury to his left hip with Arnaldi leading 7-5, 5-2.