set point

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.

Paolini and Errani, who won Olympic doubles gold together in Paris this summer, saved three set points before breaking the Poles' serve and then clinching the opener.

Yue, the world number 40, recovered an early break in the opening set but Raducanu landed another blow in the ninth game before taking her first set point on serve.