The game of tennis demands exceptional agility, technique and strength out of its players. It involves high levels of concentration and the ability to keep one’s emotions in check. Given these requirements, it’s understandable why there are so few who can rightly boast the claim of being “the world’s best”. Ultimately, every year, it comes down to one man. Throughout the years of the game, there have been many intense rivalries leading up to who would be declared the current greatest male tennis player in the world.