It must rank as one of the most endearing moments of this year’s Wimbledon - when a four time Grand Slam winner invited a spectator to join in her match.

Kim Clijsters beckoned a fan onto the court during her invitation doubles match on Friday, after he shouted out his suggestion for where she could serve.

But instead of upbraiding him for his cheek, Clijsters - a three times US Open winner and twice Wimbledon semi finalist - invited him to face her serve by taking the place of her opponent at the other end of Court Three.

You could call it the SW19 equivalent of ‘come and have a go if you think you’re hard enough’.