World number one Simona Halep was beaten in the fourth round of the women's singles ©Getty Images

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Simona Halep was beaten by Serena Williams in three sets ©Getty Images
Simona Halep was beaten by Serena Williams in three sets ©Getty Images
Naomi Osaka came from a set down to secure a quarter-final spot ©Getty Images
Naomi Osaka came from a set down to secure a quarter-final spot ©Getty Images
Novak Djokovic won his last 16 match in four sets ©Getty Images
Novak Djokovic won his last 16 match in four sets ©Getty Images
The men's world number one is aiming for a seventh Australian Open title ©Getty Images
The men's world number one is aiming for a seventh Australian Open title ©Getty Images
He will now face Japan's Kei Nishikori in the quarter-finals ©Getty Images
He will now face Japan's Kei Nishikori in the quarter-finals ©Getty Images
Pablo Carreno Busta showed exhaustion during the five set match with Nishikori ©Getty Images
Pablo Carreno Busta showed exhaustion during the five set match with Nishikori ©Getty Images
The Spaniard showed frustration after losing the final set tie break ©Getty Images
The Spaniard showed frustration after losing the final set tie break ©Getty Images
Fourth seed Alexander Zverev took out his frustrations on his racket ©Getty Images
Fourth seed Alexander Zverev took out his frustrations on his racket ©Getty Images
He lost in straight sets to Canada's Milos Raonic ©Getty Images
He lost in straight sets to Canada's Milos Raonic ©Getty Images