Bloomsbury Sport

One hand is for power and the other one for taking aim: ‘In my case, I am right-handed, so I use the right hand to give power to my stroke and the left hand to aim at the target and give direction to my stroke.’

Dominic Thiem, who was 20 when he broke into the world’s top 100,

The worst mistake you can make is to lift the ball up too high over the net, as that will give your opponent an easy passing shot: ‘You want to keep the ball as low as possible.’