The Chile international finished splendidly after being set up by Mesut Ozil to help Arsenal's slim chances of completing the campaign in the top four.
20 - Alexis Sanchez is the first Arsenal player to score 20 league goals in a season since Robin van Persie in 2011/12 (30). Haul.— OptaJoe (@OptaJoe) May 10, 2017
With his 20th goal of the season, Alexis became the first player since Robin van Persie to reach that milestone - with the Dutch striker exceeding that tally in 2011-12 by netting on 30 occasions as Arsenal finished third in the Premier League.
Alexis scored 16 league goals in his first season at the Emirates, following it up with 13 in his second campaign, but his third season in the Premier League has been his best to date.
14 - Alexis Sanchez now has 14 away Premier League goals this season, more than any other player. Acclimatized.— OptaJoe (@OptaJoe) May 10, 2017
The 28-year-old's strike against Southampton was also his 14th away goal - more than any other player in the division.