Novak Djokovic faces Alexander Zverev in the semi-finals of the Australian Open, with the Serb's bid for a record 25th Grand Slam title picking up steam at just the right time.
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Under-achieving Zverev knows it's time to deliverWorld No.2 Alexander Zverev has flown under the radar but can't avoid the spotlight playing 10-time Australian Open champ Novak Djokovic in the semi-finals.
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