NEW YORK, NEW YORK - SEPTEMBER 01: Taylor Fritz of the United States wears an Oura Ring against Darwin Blanch of the United States during their Men's Singles First Round match on Day Three of the 2026 US Open at USTA Billie Jean King National Tennis Center on September 01, 2026 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Sarah Stier/Getty Images)

NEW YORK, NEW YORK - SEPTEMBER 01: Taylor Fritz of the United States returns a shot against Darwin Blanch of the United States during their Men's Singles First Round match on Day Three of the 2026 US Open at USTA Billie Jean King National Tennis Center on September 01, 2026 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Sarah Stier/Getty Images)

NEW YORK, NEW YORK - SEPTEMBER 01: Taylor Fritz of the United States wears an Oura Ring against Darwin Blanch of the United States during their Men's Singles First Round match on Day Three of the 2026 US Open at USTA Billie Jean King National Tennis Center on September 01, 2026 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Sarah Stier/Getty Images)

NEW YORK, NEW YORK - SEPTEMBER 01: Taylor Fritz of the United States wears an Oura Ring against Darwin Blanch of the United States during their Men's Singles First Round match on Day Three of the 2026 US Open at USTA Billie Jean King National Tennis Center on September 01, 2026 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Sarah Stier/Getty Images)

NEW YORK, NEW YORK - SEPTEMBER 01: Taylor Fritz of the United States wears an Oura Ring against Darwin Blanch of the United States during their Men's Singles First Round match on Day Three of the 2026 US Open at USTA Billie Jean King National Tennis Center on September 01, 2026 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Sarah Stier/Getty Images)

NEW YORK, NEW YORK - SEPTEMBER 01: Taylor Fritz of the United States wears an Oura Ring against Darwin Blanch of the United States during their Men's Singles First Round match on Day Three of the 2026 US Open at USTA Billie Jean King National Tennis Center on September 01, 2026 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Sarah Stier/Getty Images)

NEW YORK, NEW YORK - SEPTEMBER 01: Taylor Fritz of the United States wears an Oura Ring against Darwin Blanch of the United States during their Men's Singles First Round match on Day Three of the 2026 US Open at USTA Billie Jean King National Tennis Center on September 01, 2026 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Sarah Stier/Getty Images)

NEW YORK, NEW YORK - SEPTEMBER 01: Taylor Fritz of the United States wears an Oura Ring against Darwin Blanch of the United States during their Men's Singles First Round match on Day Three of the 2026 US Open at USTA Billie Jean King National Tennis Center on September 01, 2026 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Sarah Stier/Getty Images)