The 2018 Next Gen ATP Finals is down to four players.

On Thursday evening, top seed Stefanos Tsitsipas continued his strong play, defeating Polish No. 1 Hubert Hurkacz 4-1, 4-3(3), 4-1 in 62 minutes. That victory set the semi-final match-ups at the Fiera Milano: Tsitsipas will face 2017 Andrey Rublev, and Group B winner Alex de Minaur will clash against Spaniard Jaume Munar.

Tsitsipas has shown why he is the top seed here in Milan, winning all three of his round-robin matches to top Group A. The Greek has lost just one set all week, coming in his first match of the week against Munar.

Watch Live On Amazon Prime: United States | All Other Regions

Hurkacz appeared ready to turn the match around in the second set when he earned a mini-break to take a 2/0 lead in the tie-break. But Tsitsipas quickly reeled off seven consecutive points to regain control of the match.

At that point, Hurkacz’s chances of advancing to the last four appeared bleak, needing to triumph in five sets. And Tsitsipas wasted no time, eliminating the Pole by saving all three break points he faced in the final set.