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World No.1s and defending champions Novak Djokovic and Serena Williams.
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Spaniard Rafael Nadal has won the Australian Open once - back in 2009.
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Caroline Wozniacki will be hoping to start the season well in Melbourne.
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Maria Sharapova won the Australian Open back in 2008.
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Coach Boris Becker makes an unusual demonstration to his player Novak Djokovic.
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Four-time champion Roger Federer gets to work on the Rod Laver Arena.
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Andy Murray has been runner-up on four occasions in Melbourne.
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Kei Nishikori will be hoping to start the season in style down under.