The 11-time Grand Slam champion from Spain ousted seventh-seeded countryman Daniel Gimeno-Traver 6-1, 6-4. Nadal will now face third seed Jeremy Chardy.
“Today, I had more confidence than the other days,” said Nadal, who also entered doubles here in order to gain more match experience.
“That is positive. It gives me confidence, and reasons to believe that I’m on the right way. I’m happy to win in singles against a tough opponent like Dani and to reach the semi-finals after seven months,” he said. “In this tournament, I had a good feeling. The crowd gave me their support all the time,” he added.