Lorenzo Insigne | Napoli
Market Value January 1st 2012 - £525k
Market Value June 2013 - £9.7m
Difference - £9.2m
Percentage - 1733 per cent increase
Insigne has been superb for Italy U21s at the European Championships in Israel this summer, and in the last 18 months he's gone from loan star at Pescara to first-team regular at Napoli.