“This weekend, Atletico Madrid host Barcelona at the Vicente Calderon stadium in the biggest game of the European season so far. The two sides are level on points, and therefore it is literally a top of the table clash – La Liga’s rules mean teams are separated by head-to-head results rather than goal difference, and therefore having not played each other this season, the sides can’t be separated. Halfway through the season, La Liga’s best two clubs are neck-and-neck, joint first.” Zonal Marking