Arturo Vidal
Few players have more of a point to prove heading into the quarter-finals than Arturo Vidal.
The Chile midfielder courted controversy earlier in the competition after writing-off his Ferrari and being held by police for alleged drink-driving.
The star has been handed a reprieve by the hosts, and must hope that his work on the field can ultimately do the talking.
If he can overcome his off-field problems, the Juventus man may be set for a big summer move; Arsene Wenger has confirmed his interest in the player, while Manchester United have also been linked to the box-to-box star [Mirror].