Opelka, ranked 47th, sealed victory on his first match point to win 7-5, 7-6 (7/2) in 1hr 41min for his fourth victory of the week without dropping a set.
Rome: American Reilly Opelka booked a spot in his first Masters semi-final on Friday with a straight-sets win over Argentine qualifier Federico Delbonis in the Italian Open.
Opelka, ranked 47th, sealed victory on his first match point to win 7-5, 7-6 (7/2) in 1hr 41min for his fourth victory of the week without dropping a set.
The 23-year-old will next meet either nine-time Rome winner Rafael Nadal, the number two seed, or Germany’s Alexander Zverev, the 2017 champion, for a place in the final.
“I’m surprised, clay’s not really my thing, not an American thing, it’s probably just a fluke,” said the player from Michigan.
“I’ve served well especially at big moments, that’s been key, I stayed calm,” continued Opelka, who has hit nearly 80 aces this week in the Foro Italico.
“I’ve made some adjustments on my serve recently and it has paid off.”
Opelka, who arrived in Rome on a six-match losing streak, has been on the comeback after a slump in form having suffered from COVID-19 earlier this year.
“I’d only played one tournament on clay. I had Covid. I wish I could use that as an excuse, but I just didn’t play well.”
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