The midfielder was at his best at St Mary's and kick-started our revival after going behind inside two minutes with a towering header in the first half.
Harry Kane and Heung-Min Son put us 3-1 up in the second half before Dele put the icing on the cake on a fine away display with the fourth. That made it six goals already for the 20-year-old in the Premier League this term.
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MAN OF THE MATCH - SOUTHAMPTON
Dele Alli - 56%
Danny Rose - 21%
Moussa Sissoko 13%
Christian Eriksen - 10%