Heavy rainfall deposited dust on day four of the Australian Open, delaying play on the outside courts ©Getty Images

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Staff clean a court after the dust fell ©Getty Images
Staff clean a court after the dust fell ©Getty Images
Australia's Nick Kyrgios went through after mimicking Rafael Nadal ©Getty Images
Australia's Nick Kyrgios went through after mimicking Rafael Nadal ©Getty Images
World number one Nadal also went through ©Getty Images
World number one Nadal also went through ©Getty Images
Women's second seed Karolína Plíšková went through in straight sets ©Getty Images
Women's second seed Karolína Plíšková went through in straight sets ©Getty Images
Home fans cheer on Australian wildcard Alex Bolt, who took fifth seed Dominic Thiem to five sets before defeat ©Getty Images
Home fans cheer on Australian wildcard Alex Bolt, who took fifth seed Dominic Thiem to five sets before defeat ©Getty Images
Wimbledon champion Simona Halep celebrates her win over Harriet Dart ©Getty Images
Wimbledon champion Simona Halep celebrates her win over Harriet Dart ©Getty Images
Fans sitting in deckchairs on day four ©Getty Images
Fans sitting in deckchairs on day four ©Getty Images
Former champion Stanislas Wawrinka won a five-set epic ©Getty Images
Former champion Stanislas Wawrinka won a five-set epic ©Getty Images
France's Gael Monfils gives the thumbs up after hitting the deck during his match ©Getty Images
France's Gael Monfils gives the thumbs up after hitting the deck during his match ©Getty Images