Spurs were pegged back by Sofiane Boufal's strike in a 1-1 draw at St Mary's in the first meeting and looked set to be knocked out of the competition when they trailed 2-1 in the return game at Tottenham Hotspur Stadium.
Son rescues Spurs in five-goal Southampton thriller
Son Heung-min scored a late penalty as Tottenham produced a late rally to beat Southampton 3-2 in Thursday's (AEDT) FA Cup fourth-round replay.

Lucas Moura (L) and Son Heung-min Source: Getty Images
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By SBS Sport
Presented by Yang J. Joo
Source: Omnisport
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