The era of men's tennis between 2000 and 2020 is often lauded by many as being a golden age of men's tennis,in part because of the dominance of four players -- known as the Big Four -- and the high quality of tennis they produced and helped produced across this era. Those four players were Roger Federer of Switzerland, Rafael Nadal of Spain, Novak Djokovic of Serbia, and Andy Murray of Great Britain.