Third seed Agnieszka Radwanska and fifth-seeded Chinese star Li Na were a pair of first-round winners on Day 1 at the 2013 U.S. Open.
The 2012 Wimbledon runner-up Radwanska, of Poland, routed Spaniard Silvia Soler-Espinosa 6-1, 6-2 at Arthur Ashe Stadium, while this year's Australian Open runner-up and the former French Open champion Li leveled Belarusian Olga Govortsova 6-2, 6-2 on the grounds at the USTA Billie Jean King National Tennis Center.
Meanwhile, 18th-seeded Spaniard Carla Suarez Navarro dismantled American Lauren Davis 6-0, 6-0 and 23rd-seeded American Jamie Hampton bested Spaniard Lara Arruabarrena 6-4, 6-2.
Some other seeded winners on Monday were No. 25 Estonian Kaia Kanepi and No. 30 Brit Laura Robson, who handled Spaniard Lourdes Dominguez Lino, 7-5, 6-0. Kanepi overcame American Vania King, 4-6, 7-6 (7-4), 6-1.
A mild upset came when Austrian Patricia Mayr-Achleitner doused 29th-seeded Slovak Magdalena Rybarikova, 7-6 (7-2), 6-3.
Also advancing was American Coco Vandeweghe, who topped Serb Aleksandra Krunic 6-4, 7-6 (7-5).