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Tennis is one of the most popular sports in the world. Players must focus on Fitness, Nutrition and Psychology. Who is the greatest ever, the fittest ever? It might be Federer, but Nadal and Williams have the most grand slam wins.
Check out the 800+ sports in the Encyclopedia of Every Sport. Well not every sport, as there is a list of unusual sports, extinct sports and newly created sports. How to get on these lists? See What is a sport? We also have sports winners lists, and about major sports events and a summary of every year.