NEW YORK, NEW YORK - AUGUST 26: Karolina Muchova of Czechia returns a shot while playing with Jakub Mensik of Czechia during the Mixed Doubles Final of the US Open against Belinda Bencic of Switzerland and Flavio Cobolli of Italy at USTA Billie Jean King National Tennis Center on August 26, 2026 in New York City. (Photo by Caleb Bowlin/Getty Images)

Czech Republic's Jakub Mensik celebrates after he and partner Czech Republic's Karolina Muchova beat Switzerland's Belinda Bencic and Italy's Flavio Cobolli in the mixed doubles final tennis match of the 2026 US Open tennis tournament at the USTA Billie Jean King National Tennis Center in New York on August 26, 2026. (Photo by TIMOTHY A. CLARY / AFP via Getty Images)

Czech Republic's Jakub Mensik celebrates after he and partner Czech Republic's Karolina Muchova beat Switzerland's Belinda Bencic and Italy's Flavio Cobolli in the mixed doubles final tennis match of the 2026 US Open tennis tournament at the USTA Billie Jean King National Tennis Center in New York on August 26, 2026. (Photo by TIMOTHY A. CLARY / AFP via Getty Images)

NEW YORK, NEW YORK - AUGUST 26: Karolina Muchova of Czechia and Jakub Mensik of Czechia embrace Belinda Bencic of Switzerland and Flavio Cobolli of Italy at the net after the Mixed Doubles Final of the US Open at USTA Billie Jean King National Tennis Center on August 26, 2026 in New York City. (Photo by Sarah Stier/Getty Images)

NEW YORK, NEW YORK - AUGUST 26: Karolina Muchova of Czechia and Jakub Mensik of Czechia embrace Belinda Bencic of Switzerland and Flavio Cobolli of Italy at the net after the Mixed Doubles Final of the US Open at USTA Billie Jean King National Tennis Center on August 26, 2026 in New York City. (Photo by Sarah Stier/Getty Images)

NEW YORK, NEW YORK - AUGUST 26: Karolina Muchova of Czechia and Jakub Mensik of Czechia celebrate after defeating Belinda Bencic of Switzerland and Flavio Cobolli of Italy in the Mixed Doubles Final of the US Open at USTA Billie Jean King National Tennis Center on August 26, 2026 in New York City. (Photo by Caleb Bowlin/Getty Images)

NEW YORK, NEW YORK - AUGUST 26: Karolina Muchova of Czechia and Jakub Mensik of Czechia celebrate after defeating Belinda Bencic of Switzerland and Flavio Cobolli of Italy in the Mixed Doubles Final of the US Open at USTA Billie Jean King National Tennis Center on August 26, 2026 in New York City. (Photo by Caleb Bowlin/Getty Images)

NEW YORK, NEW YORK - AUGUST 26: Karolina Muchova of Czechia and Jakub Mensik of Czechia celebrate after defeating Belinda Bencic of Switzerland and Flavio Cobolli of Italy in the Mixed Doubles Final of the US Open at USTA Billie Jean King National Tennis Center on August 26, 2026 in New York City. (Photo by Sarah Stier/Getty Images)