A boy carries a school bag and a tennis racquet during the COVID-19 pandemic in the Brooklyn borough of New York City, U.S., December 2, 2020. REUTERS/Jeenah Moon

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Russia's Daniil Medvedev embraces Austria's Dominic Thiem after he wins their final match Action Images via Reuters/Paul Childs

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Russia's Daniil Medvedev lifts the trophy as he celebrates winning the final match against Austria's Dominic Thiem Action Images via Reuters/Paul Childs

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Russia's Daniil Medvedev with the trophy after winning the final match against Austria's Dominic Thiem REUTERS/Toby Melville

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Russia's Daniil Medvedev celebrates with the trophy after winning the final match against Austria's Dominic Thiem Action Images via Reuters/Paul Childs

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Russia's Daniil Medvedev lifts the trophy as he celebrates winning the final match against Austria's Dominic Thiem Action Images via Reuters/Paul Childs

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Russia's Daniil Medvedev lifts the trophy as he celebrates winning the final match against Austria's Dominic Thiem Action Images via Reuters/Paul Childs

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Russia's Daniil Medvedev kisses the trophy as he celebrates winning the final match against Austria's Dominic Thiem Action Images via Reuters/Paul Childs

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Russia's Daniil Medvedev lifts the trophy as he celebrates winning the final match against Austria's Dominic Thiem Action Images via Reuters/Paul Childs

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Russia's Daniil Medvedev celebrates with the trophy after winning the final match against Austria's Dominic Thiem Action Images via Reuters/Paul Childs

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Russia's Daniil Medvedev lifts the trophy as he celebrates winning the final match against Austria's Dominic Thiem Action Images via Reuters/Paul Childs

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Russia's Daniil Medvedev kisses the trophy as he celebrates winning the final match against Austria's Dominic Thiem Action Images via Reuters/Paul Childs

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Russia's Daniil Medvedev kisses the trophy as he celebrates winning the final match against Austria's Dominic Thiem Action Images via Reuters/Paul Childs

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Russia's Daniil Medvedev kisses the trophy as he celebrates winning the final match against Austria's Dominic Thiem Action Images via Reuters/Paul Childs TPX IMAGES OF THE DAY

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Russia's Daniil Medvedev celebrates with the trophy after winning the final match against Austria's Dominic Thiem Action Images via Reuters/Paul Childs

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Russia's Daniil Medvedev celebrates with the trophy after winning the final match against Austria's Dominic Thiem Action Images via Reuters/Paul Childs

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Russia's Daniil Medvedev celebrates with the trophy after winning the final match against Austria's Dominic Thiem Action Images via Reuters/Paul Childs

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Russia's Daniil Medvedev kisses the trophy as he celebrates winning the final match against Austria's Dominic Thiem REUTERS/Toby Melville

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Austria's Dominic Thiem looks dejected after losing his final match against Russia's Daniil Medvedev REUTERS/Toby Melville

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Russia's Daniil Medvedev kisses the trophy as he celebrates winning the final match against Austria's Dominic Thiem REUTERS/Toby Melville

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Russia's Daniil Medvedev lifts the trophy as he celebrates winning the final match against Austria's Dominic Thiem REUTERS/Toby Melville

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Russia's Daniil Medvedev lifts the trophy as he celebrates winning the final match against Austria's Dominic Thiem REUTERS/Toby Melville

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Russia's Daniil Medvedev lifts the trophy as he celebrates winning the final match against Austria's Dominic Thiem Action Images via Reuters/Paul Childs

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Russia's Daniil Medvedev lifts the trophy as he celebrates winning the final match against Austria's Dominic Thiem Action Images via Reuters/Paul Childs

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Russia's Daniil Medvedev lifts the trophy as he celebrates winning the final match against Austria's Dominic Thiem Action Images via Reuters/Paul Childs

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Russia's Daniil Medvedev lifts the trophy as he celebrates winning the final match against Austria's Dominic Thiem REUTERS/Toby Melville

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Russia's Daniil Medvedev lifts the trophy as he celebrates winning the final match against Austria's Dominic Thiem REUTERS/Toby Melville

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Russia's Daniil Medvedev lifts the trophy as he celebrates winning the final match against Austria's Dominic Thiem Action Images via Reuters/Paul Childs

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Russia's Daniil Medvedev lifts the trophy as he celebrates winning the final match against Austria's Dominic Thiem Action Images via Reuters/Paul Childs

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Russia's Daniil Medvedev embraces Austria's Dominic Thiem after winning their final match Action Images via Reuters/Paul Childs

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Austria's Dominic Thiem holds his runners up shield after losing the final against Russia's Daniil Medvedev REUTERS/Toby Melville

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Russia's Daniil Medvedev celebrates winning his final match against Austria's Dominic Thiem Action Images via Reuters/Paul Childs

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Russia's Daniil Medvedev celebrates winning his final match against Austria's Dominic Thiem Action Images via Reuters/Paul Childs

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Russia's Daniil Medvedev embraces Austria's Dominic Thiem after winning their final match REUTERS/Toby Melville

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Austria's Dominic Thiem looks dejected after losing his final match against Russia's Daniil Medvedev Action Images via Reuters/Paul Childs

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Russia's Daniil Medvedev shakes hands with Austria's Dominic Thiem as he celebrates winning their final match REUTERS/Toby Melville

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Russia's Daniil Medvedev shakes hands with Austria's Dominic Thiem as he celebrates winning their final match REUTERS/Toby Melville

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Russia's Daniil Medvedev shakes hands with Austria's Dominic Thiem as he celebrates winning their final match REUTERS/Toby Melville

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Austria's Dominic Thiem looks dejected after losing his final match against Russia's Daniil Medvedev Action Images via Reuters/Paul Childs

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Austria's Dominic Thiem looks dejected after losing his final match against Russia's Daniil Medvedev Action Images via Reuters/Paul Childs

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Austria's Dominic Thiem looks dejected after losing his final match against Russia's Daniil Medvedev Action Images via Reuters/Paul Childs

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Russia's Daniil Medvedev shakes hands with Austria's Dominic Thiem as he celebrates winning their final match Action Images via Reuters/Paul Childs

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Russia's Daniil Medvedev celebrates winning his final match against Austria's Dominic Thiem REUTERS/Toby Melville

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Russia's Daniil Medvedev celebrates winning his final match against Austria's Dominic Thiem REUTERS/Toby Melville

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Russia's Daniil Medvedev reacts during his final match against Austria's Dominic Thiem Action Images via Reuters/Paul Childs

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Russia's Daniil Medvedev in action during his final match against Austria's Dominic Thiem Action Images via Reuters/Paul Childs

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Russia's Daniil Medvedev in action during his final match against Austria's Dominic Thiem Action Images via Reuters/Paul Childs

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Russia's Daniil Medvedev in action during his final match against Austria's Dominic Thiem Action Images via Reuters/Paul Childs

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Austria's Dominic Thiem during his final match against Russia's Daniil Medvedev REUTERS/Toby Melville

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Austria's Dominic Thiem reacts during his final match against Russia's Daniil Medvedev REUTERS/Toby Melville

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Russia's Daniil Medvedev in action during his final match against Austria's Dominic Thiem REUTERS/Toby Melville

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Austria's Dominic Thiem reacts during his final match against Russia's Daniil Medvedev Action Images via Reuters/Paul Childs

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Austria's Dominic Thiem in action during his final match against Russia's Daniil Medvedev Action Images via Reuters/Paul Childs

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Russia's Daniil Medvedev reacts during the second set tie break in his final match against Austria's Dominic Thiem REUTERS/Toby Melville

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Austria's Dominic Thiem reacts during his final match against Russia's Daniil Medvedev Action Images via Reuters/Paul Childs

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Russia's Daniil Medvedev in action during his final match against Austria's Dominic Thiem REUTERS/Toby Melville

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Austria's Dominic Thiem in action during his final match against Russia's Daniil Medvedev REUTERS/Toby Melville

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Austria's Dominic Thiem reacts on the ground during his final match against Russia's Daniil Medvedev REUTERS/Toby Melville

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Austria's Dominic Thiem reacts during his final match against Russia's Daniil Medvedev Action Images via Reuters/Paul Childs

Tennis - ATP Finals - The O2, London, Britain - November 22, 2020 Austria's Dominic Thiem reacts during his final match against Russia's Daniil Medvedev REUTERS/Toby Melville