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However, top seed Pegula saved three set points and then won six games in a row to seal victory against an opponent 40 places below her in the world rankings.

The world number 60 held a 5-2 lead and had four set points in the eighth game, before calling to see the doctor.

Norrie, ranked 77th in the world, was broken three times before handing Paul the opener with a double fault on the second set point.

After he slapped a volley into the net on set point, seventh seed Djokovic immediately approached Zverev and shook his hand after 80 minutes of play.

The Olympic gold medallist served for the opening set at 5-4 40-0, but could not take any of her three set points.