Sofia Kenin of the U.S. celebrates with the trophy after winning her match against Spain's Garbine Muguruza in Australian Open Women's Singles Final at Melbourne Park, Melbourne, Australia, February 1, 2020. Kenin counter-punched her way back from a set down against Garbine Muguruza to win her first Grand Slam title at the Australian Open with a 4-6 6-2 6-2 win on Saturday. REUTERS/Kai Pfaffenbach

Sofia Kenin of the U.S. poses with the trophy after winning her match against Spain's Garbine Muguruza in Australian Open Women's Singles Final at Melbourne Park, Melbourne, Australia, February 1, 2020. Kenin counter-punched her way back from a set down against Garbine Muguruza to win her first Grand Slam title at the Australian Open with a 4-6 6-2 6-2 win on Saturday. REUTERS/Hannah Mckay

Sofia Kenin of the U.S. celebrates as she kisses the trophy after winning her match against Spain's Garbine Muguruza in Australian Open Women's Singles Final at Melbourne Park, Melbourne, Australia, February 1, 2020. Kenin counter-punched her way back from a set down against Garbine Muguruza to win her first Grand Slam title at the Australian Open with a 4-6 6-2 6-2 win on Saturday. REUTERS/Hannah Mckay

Sofia Kenin of the U.S. celebrates as she kisses the trophy after winning her match against Spain's Garbine Muguruza in Australian Open Women's Singles Final at Melbourne Park, Melbourne, Australia, February 1, 2020. Kenin counter-punched her way back from a set down against Garbine Muguruza to win her first Grand Slam title at the Australian Open with a 4-6 6-2 6-2 win on Saturday. REUTERS/Issei Kato

Sofia Kenin of the U.S. and Spain's Garbine Muguruza pose with the trophies after their match in Australian Open Women's Singles Final at Melbourne Park, Melbourne, Australia, February 1, 2020. Kenin counter-punched her way back from a set down against Garbine Muguruza to win her first Grand Slam title at the Australian Open with a 4-6 6-2 6-2 win on Saturday. REUTERS/Hannah Mckay

Sofia Kenin of the U.S. celebrates with the trophy and ballkids after winning her match against Spain's Garbine Muguruza in Australian Open Women's Singles Final at Melbourne Park, Melbourne, Australia, February 1, 2020. Kenin counter-punched her way back from a set down against Garbine Muguruza to win her first Grand Slam title at the Australian Open with a 4-6 6-2 6-2 win on Saturday. REUTERS/Kai Pfaffenbach