NEW YORK, NEW YORK - AUGUST 26: Jakub Mensik of Czechia react after a point while playing with Karolina Muchova 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)

NEW YORK, NEW YORK - AUGUST 26: Jakub Mensik of Czechia react after a point while playing with Karolina Muchova 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)

NEW YORK, NEW YORK - AUGUST 26: Karolina Muchova of Czechia and Jakub Mensik of Czechia interact 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 Sarah Stier/Getty Images)

NEW YORK, NEW YORK - AUGUST 26: Karolina Muchova of Czechia and Jakub Mensik of Czechia interact during a break between sets in 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)

NEW YORK, NEW YORK - AUGUST 26: Karolina Muchova of Czechia and Jakub Mensik of Czechia interact 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)

Switzerland's Belinda Bencic celebrates a point during the mixed doubles final tennis match against Czech Republic's Karolina Muchova and Czech Republic's Jakub Mensik 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 CHARLY TRIBALLEAU / AFP via Getty Images)

NEW YORK, NEW YORK - AUGUST 26: Karolina Muchova of Czechia and Jakub Mensik of Czechia interact 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 Karolina Muchova plays a volley during the mixed doubles final tennis match with partner Czech Republic's Jakub Mensik against Switzerland's Belinda Bencic and Italy's Flavio Cobolli 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 CHARLY TRIBALLEAU / AFP via Getty Images)