MILAN, ITALY - NOVEMBER 09: Daniil Medvedev of Russia celebrates the victory at the end of the match against Jared Donaldson of the United States during Day 3 of the Next Gen ATP Finals on November 9, 2017 in Milan, Italy. (Photo by Emilio Andreoli/Getty Images)
Getty Images

Getty Images Sport Emilio Andreoli

MILAN, ITALY - NOVEMBER 09: Jared Donaldson of the United States returns a forehand in his group stage match against Daniil Medvedev of Russia during Day 3 of the Next Gen ATP Finals on November 9, 2017 in Milan, Italy. (Photo by Emilio Andreoli/Getty Images)
Getty Images

Getty Images Sport Emilio Andreoli

MILAN, ITALY - NOVEMBER 09: Daniil Medvedev of Russia returns a forehand in his group stage match against Jared Donaldson of the United States during Day 3 of the Next Gen ATP Finals on November 9, 2017 in Milan, Italy. (Photo by Emilio Andreoli/Getty Images)
Getty Images

Getty Images Sport Emilio Andreoli

MILAN, ITALY - NOVEMBER 09: Jared Donaldson of the United States looks on in his match against Daniil Medvedev of Russia during Day 3 of the Next Gen ATP Finals on November 9, 2017 in Milan, Italy. (Photo by Emilio Andreoli/Getty Images)
Getty Images

Getty Images Sport Emilio Andreoli

MILAN, ITALY - NOVEMBER 09: Daniil Medvedev of Russia celebrates the victory at the end of the match against Jared Donaldson of the United States during Day 3 of the Next Gen ATP Finals on November 9, 2017 in Milan, Italy. (Photo by Emilio Andreoli/Getty Images)
Getty Images

Getty Images Sport Emilio Andreoli