Novak Djokovic has started his Australian Open title defence with a tougher than expected win.
He needed four sets to beat 18-year-old Croatian Dino Prizmic, in a match which lasted over four hours.
Jodie Burrage was unable to get the British challenge up and running, losing in three sets to Germany's Tamara Korpatsch.
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2018 champion Caroline Wozniacki and fourth seed Jannik Sinner were among the other winners on day one.
