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No 4 seed moves into semi-final despite struggling against Italian
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Djokovic to meet Ben Shelton or Jannik Sinner for place in final
Ten-time Melbourne champion Novak Djokovic survived a massive scare to reach the Australian Open semi-finals when Lorenzo Musetti was forced to retire hurt while two sets up.
The fifth-seeded Italian was well on top and leading 6-4, 6-3, 1-3 when he withdrew after treatment on his upper right leg, with his movement badly impeded.