Madison Keys, seeded 22nd, overcame Hungary's world No 75 Anna Bondar in a second-round US Open match, saving five match points and winning in a deciding set tie-break with a score of 5-7 6-4 7-6(10-5). Keys secured her spot in the third round after coming from 5-3 down in the tie-break.
On Arthur Ashe Stadium, Naomi Osaka, a three-time major winner, survived a second-set challenge from Katerina Siniakova to win 6-2 5-7 6-1. Osaka will now face Belgium's Elise Mertens in the third round.
Elsewhere, 2022 champion Iga Swiatek advanced by defeating Nadia Podoroska 6-3 6-2. Swiatek is set to play 25th seed Marie Bouzkova next.