Britons Harriet Dart and Fran Jones both made winning starts to their bids to reach the US Open singles main draw.
Dart, who has twice reached the US Open second round, came through 6-0 6-7 (1-7) 6-1 against Jordyn Hazelitt in the first round of qualifying in New York.
She will face another American 16-year-old, Kristina Penickova, next.
Jones, who qualified for the US Open for the first time last year, will face Germany’s Mona Barthel after winning 6-3 6-4 against Italy’s Nuria Brancaccio.
But Jodie Burrage lost to Spain’s Guiomar Maristany 7-6 (7-1) 6-4, while Henry Searle was beaten 6-1 6-2 by American 16-year-old Michael Antonius in the men’s event.
Antonius will face former US Open finalist Kei Nishikori in the second qualifying round, after the Japanese 36-year-old battled to a 6-1 2-6 6-2 win over Austrian Sebastian Ofner.
Former US Open semi-finalist Grigor Dimitrov will face Kazakhstan’s Timofey Skatov in his second qualifying match after dismissing Italy’s Lorenzo Giustino 6-0 6-3.
In the women’s draw, 2019 US Open winner Bianca Andreescu progressed with a 6-1 6-2 win against Dutch player Eva Vedder.
Heather Watson resumes her qualifying campaign with a second-round match against Spain’s Angela Fita Boluda on Wednesday.
In the men’s draw, Britons Jacob Fearnley, Toby Samuel, Billy Harris, Harry Wendelken and Jack Pinnington Jones all return to action seeking to move one win away from the Flushing Meadows main draw.
Players must come through three rounds of qualifying to reach the singles main draw, which gets under way on Sunday.