This straight set victory ended Thiem's professional career and soared Darderi into the Second Round.

Luciano Darderi saved a stunning nine match points before Struff ultimately advanced, 6-7 (2), 7-5, 7-6 (10) at the Terra Wortmann Open.

A surprise champion in Córdoba in February, the 22-year-old Italian outlasted Shapovalov in a three-hour, 10-minute epic in his main-draw debut at his home event.