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The Dutchman saved four match points before converting the fourth of his own to reach the semi-finals at the ATP 500. 

Griekspoor, who fended off three match points against Roman Safiullin in the first round and overcame defending champion Ugo Humbert in the second, is into his eighth ATP Tour semi-final.

“I’m super happy with this win,” Griekspoor said. “I had to fight off a couple of match points in the second set… Daniil is an unbelievable player, an unbelievable competitor. He’s been at the top of the rankings for so many years, so I’m very pleased with this win.

”I thought he played so well in the first set. I didn’t do badly, he was just too good. I just tried to stay tough with it, even though I went a break down in the second. When I broke him back, I felt like the momentum went a little bit my way. I was a little bit lucky on the match points down, and in the second-set tie-break. I even needed a few match points myself to finish this one off.”

Medvedev was alert to the Dutchman’s aggressive net-rushing style and picked him off in the opening set, during which he hit just one unforced error from open play and won 100 per cent of first-serve points. Despite dropping serve early on, Griekspoor raised his level in the second set and continued with his approach. 

The 28 year-old saved two match points in each of his service games at 4-5, and 5-6, before levelling the match after a topsy-turvy tie-break.

Griekspoor, the ATP rankings No. 47, rode the momentum into the final set, in which he bided his time before pouncing in Medvedev's final service game. Griekspoor will face fourth seed Stefanos Tsitsipas, who earned a hard-fought 7-6(5), 1-6, 6-4 win over Matteo Berrettini to reach his first semi-final since July last year.

Facing double break point at 15/40 in the ninth game of the final set, Tsitsipas came up with some redline tennis and reeled off nine of the next 11 points to seal a one-hour, 57-minute victory. By reaching the semi-finals in Dubai for a third time, the two-time finalist improved to 4-1 against Berrettini.

“It’s a great feeling being back so deep in tournaments,” said Tsitsipas, who is 13-3 in Dubai. “It brings a smile on my face knowing I’ve played good tennis so far to get to this point. There were a lot of ups and downs… The first set was a great effort, but I didn’t deliver in the second. 

"But it’s confusing how I found myself winning at the end, because I felt like I was going through some mental battles during that match.”

Berrettini was chasing his first semi-final above ATP 250 level since winning at Queen’s Club in 2022, but Tsitsipas held firm in the decisive moments. The Italian dropped just one point on serve in a dominant second set, but Tsitsipas fought back with some gutsy net play to prevail in the dying embers.

In the other half of the draw, Felix Auger-Aliassime continued his impressive run of form by recording his Tour-leading 15th win in 2025 (15-4). The Canadian, who won titles in Adelaide and Montpellier this year, defeated Marin Cilic 6-4, 3-6, 6-2 to reach his fourth semi-final of the season.

“It’s been a great start,” Auger-Aliassime said. “Of course there’s the work, but then it’s just [about] seizing opportunities. Sometimes you have to be fortunate... This week I won three three-set matches that went back and forth. Now the level is so high everywhere, the margins are really small, but I’m glad that it went my way again. Another semi-final, it’s great.”

The former World No. 6, Auger-Aliassime will face qualifier Quentin Halys, who reached his first ATP 500 semi-final by rallying from a set-and-a-break deficit to overcome lucky loser Luca Nardi 2-6, 6-3, 7-6(5). The Frenchman, who stunned World No. 9 and 2022 Dubai champion Andrey Rublev in the first round, is up to No. 58 in the ATP Live Rankings.

“The end was crazy,” Halys said after his two-hour, six-minute victory. “We were missing some easy shots and playing some unbelievable rallies… I’m super happy about the win and how I handled the end of the match. I’m coming from the qualies, I didn’t have many matches before this tournament. The way I’m playing this week is crazy good.”