American teenager Coco Gauff led a day of promotion in the second round of the Dubai Championships, when Elina lost Svitolina with high heels and Petra Kvitova out with a hip problem.
The 16-year-old Gauff fought back to beat Marketa Vondrousova 3-6, 6-0, 6-4 to set up a 12th seed to put up Tereza Martincova, who disturbed 6-1 seeding Kiki Bertens, 6-4.
Svetlana Kuznetsova upset two-time champion Svitolina 2-6, 6-4, 6-1, finishing his win back in just under two hours and will face Barbora Krejcikova in the third round. . The Czechs defeated Jelena Ostapenko 6-3, 6-1.
Another teenager, 19-year-old Anastasia Potapova, defeated Madison Keys 6-4, 6-3.
Kvitova, who defeated Garbine Muguruza for the Qatar Open on Saturday, resigned Tuesday with Jil Teichmann leading 6-2, 3-4. Kvitova said she has had an adductor problem since the semifinal in Doha.
French Open champion Iga Swiatek overtook the lucky midfielder Misaki Doi, 6-2, 6-4 for the third round win with Muguruza, who defeated American teenager Amanda Anisimova, 6-4, 6-2.
Karolina Pliskova in the second seed had to dig hard for a 6-3, 6-7 (5), 6-2 win over Anastasija Sevastova and sixth seed Belinda Bencic had a tough game in beating Veronika Kudermetova 6-4, 5-7, 6-4. Bencic needed five matching points to earn his win.
Elise Mertens defeated Shelby Rogers 6-3, 6-3, but another American, Jessica Pegula, won with a 6-1, 6-2 victory over Kristina Mladenovic.
There were also winners for Caroline Garcia, Anett Kontaveit, Aryna Sabalenka, and Ons Jabeur.