To reach the top in tennis, you need several things, among them unbreakable stamina, a well-balanced diet, good coaching and dogged determination.

Oh, and it seems that getting a good night’s sleep comes in handy too.

Scientists have found that if you want your serve to be as devastating as Maria Sharapova’s or Andy Murray’s, it helps if you’ve enjoyed a proper rest beforehand.

https://www.dailymail.co.uk/health/article-2407568/Want-serve-like-Andy-Murray-Maria-Sharapova-Get-good-nights-sleep.html