Theories range from obvious mismatches to Premier League clubs not being able to defend from open playThere were 68 goals in the last 16 of the Champions League, which is not only a lot but goes against the trend of the previous four seasons. What’s going on? Has football suddenly become more attacking again? This surely can’t all be down to Premier League sides struggling to defend against teams who don’t just rely on corners but actually attack from open play, can it?An average of 4.25 goals a game is highly unusual, particularly given the recent context. Before 2008-09 there was only one season when the knockout phase of the Champions League yielded more than three goals a game; between 2008-09 and 2019-20 there was only one season when goals per game dipped below three. There then followed four campaigns in which the average did not climb above 2.72 (and in 2022-23, it was as low as 2.34), before bouncing back to 3.29 last season (including the playoff round). The playoff round thi...