Defending champion Roger Federer eased into the semi-finals of the Australian Open ©Getty Images

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Roger Federer recovered from a slow start to dispatch Tomáš Berdych in straight sets ©Getty Images
Roger Federer recovered from a slow start to dispatch Tomáš Berdych in straight sets ©Getty Images
The Czech player served for the first set but was unable to capitalise on his chance ©Getty Images
The Czech player served for the first set but was unable to capitalise on his chance ©Getty Images
World number one Simona Halep cruised into the semi-finals of the women's event ©Getty Images
World number one Simona Halep cruised into the semi-finals of the women's event ©Getty Images
The Romanian proved far too strong for the Czech Republic's Karolína Plíšková ©Getty Images
The Romanian proved far too strong for the Czech Republic's Karolína Plíšková ©Getty Images
Germany's Angelique Kerber also enjoyed serene progress as she beat American Madison Keys ©Getty Images
Germany's Angelique Kerber also enjoyed serene progress as she beat American Madison Keys ©Getty Images
The German star was in dominant form as she eased into the last four ©Getty Images
The German star was in dominant form as she eased into the last four ©Getty Images
South Korea's Hyeon Chung continued his surprise run at the tournament with victory over American Tennys Sandgren ©Getty Images
South Korea's Hyeon Chung continued his surprise run at the tournament with victory over American Tennys Sandgren ©Getty Images
Hyeon Chung will face Roger Federer for a place in the Australian Open final ©Getty Images
Hyeon Chung will face Roger Federer for a place in the Australian Open final ©Getty Images
The American player used his post-match press conference to attack the media following controversy over his social media activity ©Getty Images
The American player used his post-match press conference to attack the media following controversy over his social media activity ©Getty Images