Stefanos Tsitsipas knocked defending champion Alexander Zverev out of the Madrid Open in the quarter-finals on Friday, winning 7-5, 3-6, 6-2.
German third seed Zverev has yet to win a trophy this season and stands 4-5 on clay this spring.
Tsitsipas, the eighth seeded Greek, will face five-time champion Rafael Nadal, who blew away Swiss star Stan Wawrinka 6-1 6-2 in just one hour. The victory will be his 11th semi-final in Madrid.
In the other semi-final, Austrian Dominic Thiem will face World number one Novak Djokovic,
Thiem sensationally edged out veteran Roger Federer in three sets.
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Thiem saved two match points and ended the first chapter of Roger Federer’s return to clay court tennis with a come-from-behind 3-6, 7-6 (13/11), 6-4 win.
The 37-year-old Swiss had returned this week to the surface for the first time in three years — his last clay court match was a loss to Thiem in Rome in 2016.
While Federer was heading out, there were no such problems for top seed Novak Djokovic who made the last-four when Marin Cilic withdrew and Rafael Nadal, the second seed, who brushed aside Stan Wawrinka 6-1, 6-2.
Thiem, the 2018 Roland Garros runner-up and winner of the Barcelona title last month, prevailed in two hours 10 minutes against Federer having saved two match points in a 15-minute second set tie-break.
