World number one Jannik Sinner was drawn Thursday against big-hitting Nicolas Jarry to start his Australian Open defence while Novak Djokovic is on a collision course to meet Carlos Alcaraz in the quarter-finals. Italy's Sinner defeated Russia's Daniil Medvedev in last year's final in Melbourne to secure his first major and went on to add the US Open and ATP Finals crowns to his collection. Meanwhile, Djokovic is set to face American teenager Nishesh Basavareddy, whose parents hail from Nellore, India.But the top seed will begin his title defence under a doping cloud after twice testing positive for traces of the steroid clostebol in March.