Novak Djokovic of Serbia, who has missed the 2017 edition because of an elbow injury, celebrates winning against American John Isner during his return to the ATP Finals in London, UK, November 12, 2018. /VCG Photo

Yoshiko Tanaka of Japan competes during the Para Alpine Skiing Asian Cup at Ski Dubai in Dubai, United Arab Emirates, November 14, 2018. /VCG Photo

Poland's Agnieszka Radwanska has decided to end her 13-year-long career due to health reasons, November 14, 2018. /VCG Photo

Marc Gasol #33 scored 29 points to help the Memphis Grizzlies defeat the Milwaukee Bucks 116-113 during the NBA regular season game, November 14, 2018. /VCG Photo

Wayne Rooney #10 of England shoots as he was challenged by opponents during his farewell game, also the International Friendly game that England crushed the US 3-0 in London, UK, November 15, 2018. /VCG Photo

Japanese figure skater Yuzuru Hanyu performs in the men's short program at the Rostelecom Cup, during which he has earned a stunning 110.53 points for a flawless rendition of his routine in Moscow, Russia, November 16, 2018. /VCG Photo

All Blacks players of New Zealand compete with their Irish opponents during the Guinness Series International match between Ireland and New Zealand in Dublin, Ireland, November 17, 2018. /VCG Photo

Mikaela Shiffrin of the US competes at the ladies' slalom of FIS Alpine Ski World Cup during which she claimed the first title in Levi, Finland, November 17, 2018. /VCG Photo

Sun Xiao (L) of China battles for the ball with Akiko Kato of Japan during the FIH Champions Trophy match in Changzhou, China, November 18, 2018. /VCG Photo

Germany's Alexander Zverev celebrates with the Trophy after winning the final against Serbia's Novak Djokovic during the ATP Finals in London, UK, November 18, 2018. /VCG Photo