By Megan Humphrey The UEFA Women’s Champions League returns this week with knockout ties for the likes of Arsenal, Ajax, Benfica and Atletico Madrid. This marks the first of two rounds before the 16-team group stage which starts in October. It is split into two paths: the champions path and the league path. In both, the first round consists of two stages of one-off knockout matches played in single-venue mini-tournaments. The semi-finals come on Wednesday 4 September before the third place play-offs and finals on Saturday 7 September. The winners of each final progress to the second round, whi…