Novak Djokovic knows that if he is to make history at the Australian Open, he will need to conserve his energy.
The Serb great is bidding for a 25th Grand Slam title to take him one clear of Margaret Court's all-time singles record.
The 38-year-old has spoken about needing to protect his body for the latter stages of the majors, having been hampered by injury in three of his four Slam semi-finals last year.
A leg injury caused an early end to Djokovic's Australian Open semi-final last year, while he was hampered by a hip injury at Wimbledon and fatigue at the US Open.