During a gruelling eighth game of the second set between Novak Djokovic and Juan Martin del Potro, the three-time Academy Award and nine-time Golden Globe-winning actress was televised with a stunned look on her face.
Djokovic and Del Potro put on a thrilling show during the second set, the eighth game lasting more than 20 minutes.
The Serbian was on track for a 14th grand slam title after taking a two-sets-to-love lead.
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