Tennis is one of the most popular sports in the world, but it doesn't quite reach the top of the list. Despite an enormous following and countless fans who eagerly tune in when marquee events come along, like Wimbledon or the US Open, it trails sports such as football, basketball, and cricket. In terms of global reach, tennis is among the top popular sports in the world, with millions of players and fans. And it’s loved for the athleticism of Serena Williams and Roger Federer... or, in the case of Tiger Woods, all of his women. So, while tennis is very popular, it’s not the most popular sport in the world.