Sydney International Tennis WTA

Sydney, Australia - 7January 2018: Sydney International defending champion Angelique Kerber during a press conference at Sydney Olympic Park. (Photo by Rob Keating/robiciatennis.com)

Sydney International Tennis WTA

Sydney, Australia - 7January 2018: Sydney International defending champion Angelique Kerber during a press conference at Sydney Olympic Park. "Good. I have a little bit jet lag still because it's three hours' difference and we just arrived yesterday. I'm feeling good. I mean, the body is good. I hit already this morning with the rain." Kerber said when asked about how she was feeling after the flight over to Sydney from Perth. (Photo by Rob Keating/robiciatennis.com)

Sydney International Tennis WTA

Sydney, Australia - 7January 2018: Sydney International defending champion Angelique Kerber during a press conference at Sydney Olympic Park. (Photo by Rob Keating/robiciatennis.com)

Sydney International Tennis WTA

Sydney, Australia - 7January 2018: Sydney International defending champion Angelique Kerber during a press conference at Sydney Olympic Park. (Photo by Rob Keating/robiciatennis.com)

Sydney International Tennis WTA

Sydney, Australia - 7January 2018: Sydney International defending champion Angelique Kerber during a press conference at Sydney Olympic Park. Kerber as she listens to a question that asked "Who do you see as your main competition at the Australian Open? Who are you looking out for in particular?" (Photo by Rob Keating/robiciatennis.com)

Sydney International Tennis WTA

Sydney, Australia - 7January 2018: Sydney International defending champion Angelique Kerber during a press conference at Sydney Olympic Park. (Photo by Rob Keating/robiciatennis.com)

Sydney International Tennis WTA

Sydney, Australia - 7January 2018: Sydney International Ken Rosewall Arena being dried by leaf blowers. (Photo by Rob Keating/robiciatennis.com)

Sydney International Tennis WTA

Sydney, Australia - 7January 2018: Sloane Stephens and Jelena Ostapenko during a rain suspension of their round one doubles match at the Sydney International. (Photo by Rob Keating/robiciatennis.com)

Sydney International Tennis

Sydney, Australia - 7 January 2018: Australia's Ajla Tomljanovic stretches for a backhand against Camila Giorgi at the Sydney International. (Photo by Rob Keating/robiciatennis.com)

Sydney International Tennis

Sydney, Australia - 7 January 2018: Australia's Ajla Tomljanovic hitting a forehand against Camila Giorgi at the Sydney International. (Photo by Rob Keating/robiciatennis.com)

Sydney International Tennis

Sydney, Australia - 7January 2018: Camila Giorgi at the Sydney International. (Photo by Rob Keating/robiciatennis.com)

Sydney International Tennis

Sydney, Australia - 7 January 2018: Camila Giorgi at the Sydney International. (Photo by Rob Keating/robiciatennis.com)

Sydney International Tennis WTA

Sydney, Australia - 7 January 2018: Daria Gavrilova during her round one match at the Sydney International. (Photo by Rob Keating/robiciatennis.com)