Kazakhstan's Elena Rybakina serves to Canada's Bianca Andreescu (not in photograph) during a match of the Dubai Duty Free Tennis Championships in Dubai, United Arab Emirates, on Feb 20, 2023. (PHOTO / AP)

In a first-round matchup of former Grand Slam champions, ninth-seeded Elena Rybakina of Kazakhstan beat Canada's Bianca Andreescu 6-3, 6-4 on Monday in the Dubai (United Arab Emirates) Duty Free Tennis Championships.

Rybakina, the reigning Wimbledon champion, finished with a 6-2 edge in aces and picked on Andreescu's second serve, winning 11 of 14 points.

Rybakina took the first set in 38 minutes, but Andreescu jumped out to a 3-1 lead in the second set. However, Andreescu lost her final three service games as Rybakina closed out the match.

Latvia's Jelena Ostapenko, the 13th seed, and Belarus' Victoria Azarenka, the 15th seed, both won their opening matches in straight sets. 

Elena Rybakina took the first set in 38 minutes, but Bianca Andreescu jumped out to a 3-1 lead in the second set. However, Andreescu lost her final three service games as Rybakina closed out the match

Ukraine's Anhelina Kalinina upset 10th-seeded Veronika Kudermetova of Russia 6-3, 5-7, 7-5, and Romania's Sorana Cirstea edged 11th-seeded Beatriz Haddad Maia of Brazil 4-6, 7-6 (7), 7-5 after saving two match points in the second-set tiebreaker.

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Romania's Ana Bogdan, the Czech Republic's Karolina Muchova and Karolina Pliskova, the United States' Lauren Davis and Shelby Rogers and Belarus' Aliaksandra Sasnovich also won their opening matches.

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The United States' Caty McNally upset third-seeded Lin Zhu of China 7-6 (3), 6-7 (5), 6-1 in the first round at Merida, Mexico.

McNally overcame serving eight double faults (to three for Zhu) and winning just 27 percent of her second-serve points, 10 of 37. The match featured 15 service breaks, nine of them on Zhu's serve.

In another China-US matchup, the Chinese player won, as Wang Xiyu eliminated eighth-seeded Alison Riske-Amritraj 7-5, 4-6, 7-6 (1).

READ MORE: Wang Xiyu, Zhang Zhizhen defeated at Australian Open

Belgium's Ysaline Bonaventure, Spain's Nuria Parrizas Diaz and the United States' Katie Volynets also advanced to the second round. In late matches, seventh-seeded Elisabetta Cocciaretto of Italy faced Switzerland's Viktorija Golubic, and Australian qualifier Kimberly Birrell opposed Hungary's Anna Bondar.