Japan's Rei Sakamoto serves to Australia's Aleksandar Vukic during their men's singles first round tennis match on day one of the US Open tennis tournament at the USTA Billie Jean King National Tennis Center in New York on August 30, 2026. (Photo by CHARLY TRIBALLEAU / AFP via Getty Images)

Japan's Rei Sakamoto serves to Australia's Aleksandar Vukic during their men's singles first round tennis match on day one of the US Open tennis tournament at the USTA Billie Jean King National Tennis Center in New York on August 30, 2026. (Photo by CHARLY TRIBALLEAU / AFP via Getty Images)

Japan's Rei Sakamoto hits a return to Australia's Aleksandar Vukic during their men's singles first round tennis match on day one of the US Open tennis tournament at the USTA Billie Jean King National Tennis Center in New York on August 30, 2026. (Photo by CHARLY TRIBALLEAU / AFP via Getty Images)

Japan's Rei Sakamoto hits a return to Australia's Aleksandar Vukic during their men's singles first round tennis match on day one of the US Open tennis tournament at the USTA Billie Jean King National Tennis Center in New York on August 30, 2026. (Photo by CHARLY TRIBALLEAU / AFP via Getty Images)

Japan's Rei Sakamoto hits a return to Australia's Aleksandar Vukic during their men's singles first round tennis match on day one of the US Open tennis tournament at the USTA Billie Jean King National Tennis Center in New York on August 30, 2026. (Photo by CHARLY TRIBALLEAU / AFP via Getty Images)

NEW YORK NEW YORK - AUGUST 30: Katie Boulter of Great Britain returns a shot against Carol Young Suh Lee of the United States during their Women's Singles First Round match on Day One of the 2026 US Open at USTA Billie Jean King National Tennis Center on August 30, 2026 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Julian Finney/Getty Images)

NEW YORK NEW YORK - AUGUST 30: Aleksandar Vukic of Australia reacts against Rei Sakamoto of Japan during their Men's Singles First Round match on Day One of the 2026 US Open at USTA Billie Jean King National Tennis Center on August 30, 2026 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Patrick Smith/Getty Images)

NEW YORK NEW YORK - AUGUST 30: Katie Boulter of Great Britain returns a shot against Carol Young Suh Lee of the United States during their Women's Singles First Round match on Day One of the 2026 US Open at USTA Billie Jean King National Tennis Center on August 30, 2026 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Julian Finney/Getty Images)