Before you look at the year-end ATP Tour Rankings or WTA Tour Rankings, can you name the top five on each list?

Here's a tougher question: Which male player earned the most points outside of Grand Slam and Masters 1000 events?

Here's a much tougher question: Which player in the top 100 on each tour played the most tournaments?

Platform tennis is the one racquet sport you can play outdoors year-round, even in snow country. Its action is more continuous and intense than tennis, making staying warm pretty easy.

Strings make a huge difference in the way a racquet feels and performs. Whether you're restringing an old racquet or buying a new one, the more you know about strings, the better you can match your racquet to your arm and your game.

Photos illustrate this step-by-step lesson on how to hit the heavy slice serve. This serve has nearly pure sidespin that makes it curve sharply to the left both in the air and on the bounce.