Dementieva booked a date in the fourth round against China’s Li Na, who beat Russian Ekaterina Makarova 6-1, 4-6, 6-2 to reach the fourth round. Li missed last year’s US Open with a rib injury.
Two years ago, Li became the first Chinese woman to reach the fourth round at a US Open.
In other men’s second round play, Russian fifth seed Nikolay Davydenko defeated Agustin Calleri of Argentina, 6-4, 6-4, 7-6 (7/2) and compatriot Dmitry Tursunov beat Victor Hanescu 6-7 (2/7), 6-3, 6-4, 6-2.
Gilles Muller outlasted Germany’s Tommy Haas 2-6, 2-6, 7-6 (7/5), 6-3, 6-3.
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