A series of jaw-dropping upsets of top 10 players at the Australian Open by fearless teenagers has fuelled excitement at the future of mens tennis as the old guard fades into history. With Rafael Nadal and Andy Murray retiring last year and Novak Djokovic in the twilight of his record-breaking career, the torch has already passed to the likes of Jannik Sinner and Carlos Alcaraz. But the giant-killing exploits in Melbourne of Joao Fonseca, Learner Tien and Jakub Mensik signalled another generati
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