While most of the headlines surrounding the 2013 tennis season are focused on the world's elite, quite a few second-tier players are poised to make a major career leap.
On the men's side, it would come as a surprise if any non-Big Four member managed to break through and win a Grand Slam. That being said, plenty of success can be achieved without winning a Slam.
The women's game is still muddled at the top, although Serena Williams has proven on multiple occasions that she is the best player in the world when she wants to be.
The next wave of stars are out there gaining experience, but it's unclear which of them are destined for superstardom.
The making of a tennis star is complex, as the mental aspect of the game is just as important as the physical at this level. A competitor's mental fortitude cannot be judged by looking at winners and unforced errors, so it's often overlooked by the average tennis fan.
Here are ten tennis players to keep an eye on once the calendar flips to the new year: