(Reuters) - Briton Andy Murray started it. Four times Australian Open champion Novak Djokovic pulled a major surprise with his choice, while all-time great Roger Federer even has one despite years of shunning the entire coaching concept.
The trend of hiring big names is not restricted to the top top echelon of men's players, though. Japan's Kei Nishikori, France's Richard Gasquet and Croatia's Marin Cilic all have one also.
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