Video: Tennis bowling: Novak Djokovic vs. Maria Sharapova

Watch as tennis stars Novak Djokovic and Maria Sharpova take part in a game known as 'speed bowling'.

Forget the Australian Open, the French Open, Wimbledon or the US Open - a new craze of 'speed bowling' could be set to sweep the world of tennis.

Both Novak Djokovic and Maria Sharapova will be in action when the US Open begins in Monday, and they have been warming up in a fairly unorthodox fashion.

The aim of the game is to complete a strike using three tennis balls - and it was the Serbian who came out on top.

Watch the video below:

Maria Sharapova
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1Scotland flag Andy Murray7,750
2Spain Rafael Nadal7,555
3Switzerland Roger Federer7,145
4Switzerland Stanislas Wawrinka5,780
5Serbia Novak Djokovic5,325
6Croatia Marin Cilic5,155
7Alexander Zverev4,470
8Austria Dominic Thiem4,030
9Japan Kei Nishikori3,285
10Canada Milos Raonic3,230
11Bulgaria Grigor Dimitrov3,070
12France Jo-Wilfried Tsonga2,770
13Belgium David Goffin2,560
14Spain Roberto Bautista Agut2,425
15Czech Republic Tomas Berdych2,390
16United States Jack Sock2,335
17Pablo Carreno Busta2,305
18Lucas Pouille2,220
19United States John Isner2,110
20United States Sam Querrey2,060