The 2013 WTA season ended the way it began, with Serena Williams as the most dominant force in the game.
Williams' pursuit of Grand Slam titles is one of the hottest topics in women's tennis.
This year, Williams captured two Grand Slam titles and earned a record $12.4 million in prize money. She finished the year by defending her WTA Championships title. She takes a break and returns to action in late December in Brisbane.
Brisbane is a tuneup for the 2014 Australian Open, where Williams hopes to win her 18th Grand Slam title. That would tie her with tennis legends Martina Navratilova and Chris Evert.
Whether Williams can continue her record-setting pace is just one of the top storylines in women's tennis.