Top seed Novak Djokovic dropped his first set of the 2020 French Open on Wednesday but recovered to brush aside Pablo Carreno Busta and move into the last four.
Carreno Busta won the opener 6-4 but could not build on the advantage and Djokovic came back to take the next three sets 6-2, 6-3, 6-4.
"It took all my strength and lots of patience, he's a very good player," said Djokovic.
"He doesn't make a lot of errors so all the points were long. I started this match a bit badly with bad movement. After I found rhythm and confidence. It was important to stay focused on the key points."
In the first of the men's quarter-finals in the top half of the draw, the 22-year-old Greek downed the 13th seed Andrey Rublev 7-5, 6-2, 6-3.