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World number two Angelique Kerber moved into the second round of the Australian Open with a straight-set win over Slovenia's Polona Hercog.
The German three-time Grand Slam champion, who won the Australian Open in 2016, beat Hercog 6-2 6-2 in one hour and 12 minutes.
Fifth seed Sloane Stephens beat fellow American Taylor Townsend 6-4 6-2.
Meanwhile, Belarusian 11th seed Aryna Sabalenka cruised through against qualifier Anna Kalinskaya 6-1 6-4.
Sabalenka will face Katie Boulter in the second round after the British number two's stunning victory over Ekaterina Makarova.
