DUBAI: Fifth-seeded Coco Gauff won an all-American quarterfinal on Thursday at the Dubai Duty Free Tennis Championships, beating Madison Keys 6-2, 7-5 in the United Arab Emirates. Gauff saved the only break point she faced in the 81-minute match, and she converted four of her five break opportunities. The result moves Gauff into a semifinal matchup with top-seeded Iga Swiatek of Poland, the reigning French Open champion. Swiatek, who got a walkover into the semis when the Czech Republic’s Karolina Pliskova couldn’t play because of a viral illness, has lost no more than one game in nine of past 10 sets. The other semifinal will feature third-seeded Jessica Pegula of the United States and Barbora Krejcikova of the Czech Republic. Pegula got a quarterfinal walkover when the Czech Republic’s Karolina Muchova withdrew due to an abdominal injury. Krejcikova came from behind to upset second-seeded Aryna Sabalenka of Belurus 0-6, 7-6 (2), 6-1.