A round up of the first tranche of Champions League Second Round matches including humiliating defeats for Barcelona and Arsenal, a win for the reigning champions Real Madrid, and a woeful performance by Dortmund.

Champions League favourites, Barcelona, are going to have to do something no side has ever done before if they are going to reach the quarter-finals – overturn a four-goal first leg deficit.

The most talented group of footballers the world has ever seen were humiliated at the hands of Paris St Germain, a side who always fail to find what it takes to muscle past the true European giants when the competition gets tough, and it was a former Real Madrid player who sliced the aorta.

Angel Di Maria was destined for great things when Man United paid a British record £59.7m when they signed him in 2014, but the Argentinean failed to find the form that justified his big money move from Madrid.