Danielle Collins was left red-faced after momentarily forgetting the rules of tennis during her Wimbledon clash against title contender Iga Swiatek on Saturday

Danielle Collins temporarily forgot the rules of tennis in a comical moment against Iga Swiatek on Saturday. The American, while preparing to face down a serve from the Pole, seemed to be the only person inside Centre Court who did not realise she had made a mistake.

Poland's Iga Swiatek strode imperiously into the fourth round at Wimbledon on Saturday, with a dominant 6-2 6-3 win over an apparently out-of-sorts Danielle Collins. The former world number one, eager to show she can be a force on grass,