NEW YORK, NY - AUGUST 29: Rafael Nadal of Spain looks on during his first round Men's Singles match against Denis Istomin of Uzbekistan during his first round Men's Singles match on Day One of the 2016 US Open at the USTA Billie Jean King National Tennis Center on August 29, 2016 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Elsa/Getty Images)
NEW YORK, NY - AUGUST 29: Rafael Nadal of Spain reacts during his first round Men's Singles match against Denis Istomin of Uzbekistan during his first round Men's Singles match on Day One of the 2016 US Open at the USTA Billie Jean King National Tennis Center on August 29, 2016 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Elsa/Getty Images)
NEW YORK, NY - AUGUST 29: Rafael Nadal of Spain reacts during his first round Men's Singles match against Denis Istomin of Uzbekistan on Day One of the 2016 US Open at the USTA Billie Jean King National Tennis Center on August 29, 2016 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Elsa/Getty Images)
NEW YORK, NY - AUGUST 29: Rafael Nadal of Spain reacts during his first round Men's Singles match against Denis Istomin of Uzbekistan on Day One of the 2016 US Open at the USTA Billie Jean King National Tennis Center on August 29, 2016 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Elsa/Getty Images)
