Thanks to Marcus Rashford's second-half strike, United won a knockout round European match against a Spanish side for the first time since 2008.
That match in 2008 happened to be the second leg of the Champions League semi-final against Barcelona. Following that win, Sir Alex Ferguson's side went on to lift the European crown with a penalty-kick win over Chelsea in Moscow.
In United's previous six matches against Spanish opposition past the group stage, the club had posted five losses and one draw.
6 – Man Utd haven’t won any of their last 6 games against Spanish opponents beyond the group stage of European competition (D1 L5). Phantom. pic.twitter.com/KMpnaDV2sl— OptaJoe (@OptaJoe) May 4, 2017
United will look to advance to another European final when it hosts Celta in the return leg at Old Trafford next Thursday.