Italy's Jannik Sinner celebrates victory over USA's Ben Shelton after their men's singles semi-final match on day thirteen of the Australian Open tennis tournament in Melbourne on January 24, 2025. (Photo by Martin KEEP / AFP)

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Jannik Sinner is wary of "physical beast" Alexander Zverev as the Italian bids to join an elite group with back-to-back Australian Open titles in a final Sunday that