Every year a fresh crop of talented tennis players emerge from the juniors or ITF circuit to challenge the ATP and WTA Tours' best.
Only a handful go on to become superstars.
Who are the tennis stars of tomorrow? What separates one young talent from another?
Identifying up-and-coming players requires an assessment of the past, present and future. What types of players, based on size and style, have succeeded in the past? What type of play works today? Which youngsters playing in the current game have a career trajectory headed upward?
For the purpose of this list we excluded players older than 21 and those who have cracked the Top 20. This includes No. 8 Eugenie Bouchard and No. 6 Milos Raonic. They are no longer up-and-coming. They have already arrived.
Waiting to join or surpass them are a few talented players to keep on your radar.