American Ann Li reached the third round of the US Open by winning against Swiss Belinda Bencic, the No 16 seed, 6-3, 6-3 at the USTA Billie Jean King National Tennis Center in New York on Wednesday.
Li, ranked No 69, will play Australian qualifier Priscilla Hon next for a spot in the fourth round.
The American edged out Slovak Rebecca Sramkova (4-6, 6-2, 6-4) ahead of her win today.
In the previous round, Bencic, ranked No 18, defeated Chinese qualifier Shuai Zhang (6-3, 6-3).
New York (Grand Slam), other second-round matches (USTA Billie Jean King National Tennis Center, hard, USD 90,000,000):
Amanda Anisimova vs. Maya Joint
Donna Vekic vs. Coco Gauff
Jaqueline Cristian vs. Ashlyn Krueger
Daria Kasatkina vs. Kamilla Rakhimova
Renata Zarazua vs. Diane Parry
Anastasia Zakharova vs. Laura Siegemund
Hailey Baptiste vs. Naomi Osaka
Sorana Cirstea vs. Karolina Muchova
Magdalena Frech vs. Peyton Stearns
Zeynep Sonmez vs. Marta Kostyuk
Suzan Lamens vs. Iga Swiatek
Anna Kalinskaya vs. Yulia Putintseva
Ekaterina Alexandrova vs. Xinyu Wang
Maria Sakkari vs. Anna Bondar
Beatriz Haddad Maia vs. Viktorija Golubic
Linda Noskova vs. Eva Lys
Aryna Sabalenka vs. Polina Kudermetova
Elsa Jacquemot vs. Leylah Fernandez: wednesday
McCartney Kessler vs. Marketa Vondrousova: wednesday
Jasmine Paolini (7) beat Iva Jovic: 6-3, 6-3
Mirra Andreeva (5) beat Anastasia Potapova: 6-1, 6-3
Elise Mertens (19) beat Lulu Sun: 6-2, 6-3
Priscilla Hon beat Liudmila Samsonova (17): 4-6, 6-3, 6-2
Taylor Townsend beat Jelena Ostapenko (25): 7-5, 6-1
Elena Rybakina (9) beat Tereza Valentova (Q): 6-3, 7-6 (7)
Barbora Krejcikova beat Moyuka Uchijima: 6-4, 6-2
Jessica Pegula (4) beat Anna Blinkova: 6-1, 6-3
Cristina Bucsa beat Alexandra Eala: 6-4, 6-3
Victoria Azarenka beat Anastasia Pavlyuchenkova: 6-3, 6-3
Emma Navarro (10) beat Catherine McNally (WC): 6-2, 6-1
Emma Raducanu beat Janice Tjen (Q): 6-2, 6-1