My list is rather long but I think these fighters have the potential and skills to be top 10 p4p in the future:

Minimum - Roman Gonzalez, 24-0 20 KO's, Nicaragua - weight class might hurt him.
Jr. Fly - Giovanni Segura, 22-1-1 18 KO's, Mexico - great power for little guy.
Fly - Luis Concepcion, 19-1 14 KO's. Panama
Fly - Koki Kameda, 22-0 14 KO's, Japan
Fly - Hernan Marquez, 26-0 19 KO's, Mexico
Ban - Abner Mares, 19-0 12 KO's, Mexico
Ban - Hozumi Hasegawa, 27-2 11 KO's, Japan, Should be on list now
Ban - Chris Avalos, 13-0 10 KO's, USA
S. Ban - Juanma Lopez, 27-0 24 KO's, Puerto Rico
S. Ban - Wilfredo Vazquez Jr., 17-0-1 14 KO's, Puerto Rico
S. Ban - Rico Ramos, 14-0 8 KO's, USA
Feath - Yuriorkis Gamboa, 16-0 14 KO's, Cuba
S. Fea - Robert Guerrero, 25-1-1 17 KO's, USA
S. Fea - Juan Carlos Salgado, 21-0-1 15 KO's, Mexico
Light - Edwin Valero, 25-0 25 KO's, Venezuela
Light - Antonio DeMarco, 23-1-1 17 KO's, Mexico
Jr. Welt - Timothy Bradley, 24-0 11 KO's, USA
Jr. Welt - Marcos Rene Maidana, 27-1 26 KO's, Argentina
Jr. Welt - Victor Ortiz, 24-2-1 19 KO's, USA
Jr. Welt - Devon Alexander, 19-0 12 KO's, USA
Welter - Andre Berto, 25-0 19 KO's, USA
Welter - Saul Alvarez, 29-0-1 22 KO's, Mexico
Welter - Danny Garcia, 14-0 9 KO's, USA
Jr. Mid - Paul Williams, 37-1 27 KO's, USA, Is he there yet?
Jr. Mid - Yuri Foreman, 28-0 8 KO's, Belarus
Jr. Mid - James Kirkland, 25-0 22 KO's, USA
Jr. Mid - Alfredo Angulo, 17-1 14 KO's, Mexico
Jr. Mid - Vanes Martirosyan, 25-0 16 KO's, Armenia, very underrated
Jr. Mid - Joe Greene, 21-0 14 KO's, USA
Jr. Mid - Erislady Lara, 8-0 5 KO's, Cuba
Jr. Mid - Fernando Guerrero, 16-0 13 KO's, Dominican Rep.
S. Mid - Lucian Bute, 25-0 20 KO's, Romania, should be close now
S. Mid - David Lemieux, 19-0 19 KO's, Canada
S. Mid - Andre Ward, 21-0 13 KO's, USA
S. Mid - Andre Dirrell, 18-0 13 KO's, USA
S. Mid - Arthur Abraham, 31-0 25 KO's, Armenia, should be there already
Lt. Hea - Jean Pascal, 24-1 16 KO's, Haiti
Lt. Hea - Chad Dawson, 29-0 17 KO's, USA, should be there already
Lt. Hea - Tavoris Cloud, 20-0 18 KO's, USA
Heavy - David Haye, 23-1 21 KO's, UK
Heavy - Alexander Povetkin, 17-0 12 KO's, Russia
Heavy - Eddie Chambers, 35-1 18 KO's, USA

I probably missed some young contenders but there you go!