The closest you get to a Barca villain is midfield enforcer Sergio Busquets or wingback Dani Alves, both of whom have a penchant for taking a tumble to win a freekick, while Busquets is known for the odd dirty tackle.
Just before the hour, the Bluebirds came close to taking the lead for the first time when McCormack sent a curling 25-yard free-kick crashing against the bar.
The decisive goal came on 68 minutes, with Ledley taking advantage of some sloppy defending to saunter into the danger zone and heading in a freekick from Ki.