MADRID (Reuters) - Maria Sharapova has handpicked seven male models with tennis knowledge to act as ball-boys at the WTA Tour's end-of-season championships in Madrid.

The 19-year-old Russian was the center of attention at the casting event held in a Madrid hotel on Thursday.

...The male models, wearing white shorts and tight t-shirts, were brought up one at a time and tested on their knowledge of tennis, among other things, in a tongue-in-cheek manner.

A number of contestants struggled to respond correctly to questions such as "What is a tie break?" and "What would you do if a player asked you for a towel?"

The one's who demonstrated their own personal 'towel rack' were quickly selected...