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Alexander Zverev lost to Australia's Alex de Minaur in the semifinals of the Vienna Open, preventing him from celebrating his new world No. 1 status with a tournament victory. De Minaur, ranked 10th in the world, won 6–4, 1–6, 7–6 (4).
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Tallon Griekspoor won the European Open in Brussels, beating Germany’s Jan-Lennard Struff 4-6, 6-3, 6-4 in the final. It was the 30-year-old Dutchman’s fourth ATP title and his second ATP final of the year. Griekspoor reached the final after victories over Max Schönhaus, Mariano Navone, Jiří Lehečka and Francisco Cerúndolo. He rose from 60th to 50th in the world rankings after the tournament.