Linda Noskova, of the Czech Republic, returns the ball to Katie Volynets, of the United States, during the first round of the U.S. Open tennis championships, Monday, Aug. 31, 2026, in New York. (AP Photo/Kirsty Wigglesworth)

Linda Noskova, of the Czech Republic, returns the ball to Katie Volynets, of the United States, during the first round of the U.S. Open tennis championships, Monday, Aug. 31, 2026, in New York. (AP Photo/Kirsty Wigglesworth)

Linda Noskova, of the Czech Republic, returns the ball to Katie Volynets, of the United States, during the first round of the U.S. Open tennis championships, Monday, Aug. 31, 2026, in New York. (AP Photo/Kirsty Wigglesworth)

NEW YORK, NEW YORK - AUGUST 31: Stan Wawrinka of Switzerland acknowledges the crowd after a loss against Matteo Berrettini of Italy during their Men's Singles First Round match on Day Two of the 2026 US Open at USTA Billie Jean King National Tennis Center on August 31, 2026 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Caleb Bowlin/Getty Images)

NEW YORK, NEW YORK - AUGUST 31: Stan Wawrinka of Switzerland acknowledges the crowd after a loss against Matteo Berrettini of Italy during their Men's Singles First Round match on Day Two of the 2026 US Open at USTA Billie Jean King National Tennis Center on August 31, 2026 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Caleb Bowlin/Getty Images)

NEW YORK, NEW YORK - AUGUST 31: Stan Wawrinka of Switzerland acknowledges the crowd after a loss against Matteo Berrettini of Italy during their Men's Singles First Round match on Day Two of the 2026 US Open at USTA Billie Jean King National Tennis Center on August 31, 2026 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Caleb Bowlin/Getty Images)

NEW YORK, NEW YORK - AUGUST 31: Stan Wawrinka of Switzerland acknowledges the crowd after a loss against Matteo Berrettini of Italy during their Men's Singles First Round match on Day Two of the 2026 US Open at USTA Billie Jean King National Tennis Center on August 31, 2026 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Caleb Bowlin/Getty Images)

NEW YORK, NEW YORK - AUGUST 31: Stan Wawrinka of Switzerland acknowledges the crowd after a loss against Matteo Berrettini of Italy during their Men's Singles First Round match on Day Two of the 2026 US Open at USTA Billie Jean King National Tennis Center on August 31, 2026 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Caleb Bowlin/Getty Images)