With the men's tennis game dominated by four players and the women's game not much more fluid, it can be hard to imagine that a time will come when players not named Djokovic or Serena will dominate the Grand Slams.
While the time for a new generation of stars to assert their dominance might not yet be upon us, this year's Australian Open will showcase some of the young competitors with the greatest potential to become superstars of the sport.
The list of young talents who never developed into great pros is long, and the majority of the best young competitors are more likely to fade away than they are ever to win a Grand Slam. Still, one or two of these unknowns could one day dominate tennis the way Federer and Sharapova do today.
Here is a look at five of the most talented unknowns competing in this year's Australian Open and why they could surprise handicappers with their performances in Melbourne.