NEW YORK, NEW YORK - SEPTEMBER 07: Learner Tien of the United States returns a shot against Karen Khachanov during their Men's Singles Fourth Round match on Day Nine of the 2026 US Open at USTA Billie Jean King National Tennis Center on September 07, 2026 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)

NEW YORK, NEW YORK - SEPTEMBER 07: Learner Tien of the United States returns a shot against Karen Khachanov during their Men's Singles Fourth Round match on Day Nine of the 2026 US Open at USTA Billie Jean King National Tennis Center on September 07, 2026 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)

NEW YORK, NEW YORK - SEPTEMBER 07: Learner Tien of the United States returns a shot against Karen Khachanov during their Men's Singles Fourth Round match on Day Nine of the 2026 US Open at USTA Billie Jean King National Tennis Center on September 07, 2026 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)

NEW YORK, NEW YORK - SEPTEMBER 07: Coco Gauff of the United States returns a shot against Iva Jovic of the United States during their Women's Singles Fourth Round match on Day Nine of the 2026 US Open at USTA Billie Jean King National Tennis Center on September 07, 2026 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)

NEW YORK, NEW YORK - SEPTEMBER 07: Coco Gauff of the United States returns a shot against Iva Jovic of the United States during their Women's Singles Fourth Round match on Day Nine of the 2026 US Open at USTA Billie Jean King National Tennis Center on September 07, 2026 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)

NEW YORK, NEW YORK - SEPTEMBER 07: Coco Gauff of the United States returns a shot against Iva Jovic of the United States during their Women's Singles Fourth Round match on Day Nine of the 2026 US Open at USTA Billie Jean King National Tennis Center on September 07, 2026 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)

France's Arthur Gea reacts after losing the 3rt set to Netherlands' Botic van de Zandschulp during the men's singles round of 16 tennis match on day nine of the US Open tennis tournament at the USTA Billie Jean King National Tennis Center in New York City on September 7, 2026. (Photo by Leonardo MUNOZ / AFP via Getty Images)

USA's Coco Gauff reacts to a point as she plays USA's Iva Jovic during the women's singles round of 16 tennis match on day nine of the US Open tennis tournament at the USTA Billie Jean King National Tennis Center in New York City on September 7, 2026. (Photo by CHARLY TRIBALLEAU / AFP via Getty Images)