Britain's Jack Draper says trusting his tennis would "click into place" was the key to earning the first French Open win of his career.
Draper, seeded fifth, moved through the gears to secure a 3-6 6-1 6-4 6-2 victory against Italy's Mattia Bellucci.
The British men's number one lost on his first two appearances at Roland Garros but has returned this year as a genuine force on the clay.
After beating 68th-ranked Bellucci, Draper said he is still learning the benefits of being more patient in the five-set format at Grand Slam events.
"When I lost the first set today, I wasn't panicking at all," he said.