But how did Son play?
📷 Son: Match Snapshot
Southampton, for the first half, were simply superb. Tottenham had no answer to their attacking play and could not find any rhythm of their own. They deservedly led through an excellent Danny Ings finish.
⚽ ⏱️ 45' But just before half-time Son scored a vital goal to turn the tide of the contest. Kan floated a ball across the area to the far post and the Korean steadied himself before lashing back across the goalkeeper and into the net.
⚽ ⏱️ 46' And just minutes into the second half Son put his side ahead, running clear of Southampton's back line to slam brilliantly into the corner with his left foot.
⚽ ⏱️ 64' The hosts were still reeling from Son's strike play when he completed his hat-trick, again running clear before rolling through McCarthy's legs with comparative ease.
⚽ ⏱️ 73' And he got the fourth when Kane's sensational ball into his path was chested down and rattled in with his left foot for a special afternoon's work.
〽️ Son: Rating Week-on-Week
Son scored a perfect 10 FC Rating for his quadruple at St. Mary's, and what made it even more special was the fact that team-mate Harry Kane assisted all four of his efforts before adding a fifth goal himself. Kane also received a 10 FC Rating for his exploits.
🗝️ Key Stats
Son match stats
|FC Man of the Match
|Shots on Target
|Touches In Box
Son: What Next?
Make no mistake - Son pulled Jose Mourinho out of a serious hole. His team were not performing to anywhere near their best before the Korean got the game by the scruff of the neck.
Southampton's defending was utterly dreadful, but Son's proficiency in front of goal really is one of the best in the division, and Mourinho will hope that pairing him up with Gareth Bale will give Spurs an exciting outlook for the rest of the season.
And Kane's superb passing shows an existing relationship between the two that, as far as Tottenham are concerned, will hope can continue.