Defending champion Aryna Sabalenka moved into the second round of the U.S. Open after weathering a challenging first set in her first match.

Aryna Sabalenka of Belarus won her first round match against Rebeka Masarova of Switzerland during the 2025 U.S. Open Tennis Championship at the USTA Billie Jean King National Tennis Center in Flushing,

Defending champion Aryna Sabalenka moved into the second round of the US Open on Sunday after weathering a challenging first set in her first match. The No. 1-ranked player took down Swiss player Rebeka Masarova 7-5,