The next generation of tennis stars has arrived.
They already offer us a glimpse into what we suspect will be brilliant careers.
By "next," we mean they haven't achieved star status yet.
By "star," we mean more than someone who occasionally challenges a top player. A star has staying power.
This list does not include players like Jo-Wilfried Tsonga or Sara Errani, who have been competing with the current crop of stars for some time.
Although this list only includes players younger than 25, it does not include Juan Martin del Potro. Del Potro, 24, is already a Grand Slam winner and star.
The list is about players like Madison Keys who are making a steady climb up the rankings. It's about those players like Jerzy Janowicz who have the talent and the will to push past the average players on tour.