Mirra Andreeva, Victoria Mboko, João Fonseca and Learner Tien arrived in New York with rapid rises, difficult draws and growing expectations.
The 2025 U.S. Open opened with the sport’s established champions still setting the standard, but a group of teenagers had already become central to the tournament’s early storylines.
Russia’s Mirra Andreeva, 18, entered New York as the No. 5 seed after winning Masters-level titles in Dubai and Indian Wells earlier in the season. Canada’s Victoria Mboko, also 18, arrived after a breakthrough title run in Montreal that lifted her into the seeded ranks for her U.S. Open debut.
On the men’s side, Brazil’s João Fonseca turned 19 just before the tournament and came in after reaching the third round at Wimbledon. American Learner Tien, 19, had compiled four wins over top-10 opponents and was set for a Sunday night meeting with Novak Djokovic.
The group also included other young players making progress on tour, including Australian Maya Joint, Czech player Jakub Mensik and 17-year-old Californian Iva Jović. Their presence reflects a wider shift in a sport where recent U.S. Open champions such as Coco Gauff and Emma Raducanu broke through as teenagers.
The attention brings a new challenge: sustaining results after a sudden climb. Mboko’s rise was especially sharp, taking her from outside the top 300 at the start of 2025 to a Montreal title and a first-round match against two-time major champion Barbora Krejcikova in New York. The tournament offered an immediate test of whether this latest generation could translate promise into a deep run on one of tennis’ biggest stages.
