Novak Djokovic faces a real threat to his hopes of winning the calendar year Grand Slam in the second semi final
Novak Djokovic faces a real threat to his hopes of winning the calendar year Grand Slam in the second semi final
11 September 2021
He's faces fourth seed Alexander Zverev who beat the world number one en route to Olympic gold in Tokyo.
The second semi gets underway at 11 on Arthur Ashe Stadium.
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