Heung-Min Son's 87th-minute penalty sent Tottenham into the FA Cup fifth round as they beat Southampton 3-2 in their fourth-round replay
An early own goal from Jack Stephens (12) on his 100th Southampton appearance handed Tottenham the advantage, but Shane Long (34) equalised before the break
Danny Ings deservedly fired Southampton ahead in the 72nd minute, but not long after, Lucas Moura (78) levelled things up
As it looked like the game was heading to extra-time, Son converted from the spot after being bought down by Angus Gunn in the area to send Tottenham into the fifth round, setting up a home tie against Norwich
Southampton will be wondering what happened as they had been by far the better side, yet collapsed after going in front, and they are now left to focus on pushing for a Europa League place in the Premier League
Having seen Ings and Nathan Redmond shoot straight at Hugo Lloris in the opening 10 minutes, Spurs were the recipients of a large slice of luck at the other end as they took the lead
Harry Winks' long ball allowed Ryan Sessegnon to burst into the box, but Stephens brilliantly denied him a shot with a sliding tackle
However, he was not rewarded as the ball fell to Tanguy Ndombele on the edge of the area and the Frenchman's shot, which was going wide, cannoned off Stephens on the floor and into the bottom corner
It was cruel on Southampton but they were not deterred and continued to create regular chances
 One of them fell to Ings and he would have expected to score as James Ward-Prowse's long ball sent him in on goal, but the in-form striker hit the crossbar
The deserved equaliser came in the 34th minute as Saints sliced their visitors open again
 Redmond was given too much space to get a shot away, which Lloris could only parry into the path of Long, who made no mistake with the rebound
The second half started in a similar fashion and only a bad miss by Sofiane Boufal stopped the visitors taking the lead as he scuffed his shot at the far post and could not even hit the target
Spurs had been virtually non-existent as an attacking threat, yet they created a brilliant chance to go in front as Son's cross was begging to be headed home by Moura, but five yards out in the middle of the goal he somehow put it wide
That was a fleeting moment for Spurs as Southampton continued to look the most likely, with Jannik Vestergaard forcing Lloris into a flying save with a header
And they finally went ahead 18 minutes from time with a breakaway goal of stunning quality
 Redmond, picking the ball up on the edge of his own area, beat four men before sliding in Ings, who cut inside and clinically found the bottom corner
It looked desperate for Spurs, but to their credit they mounted a fine response, inspired by Dele Alli
 The substitute first played a one-two with Moura, before the Brazilian created some pace and fired into the bottom corner
They then won it in the 88th minute as Son scored his fourth goal in four games
 A fast break saw Alli play the South Korean in, he rounded goalkeeper Angus Gunn, but was brought down and referee David Coote pointed to the spot
 Son was the man who converted as Spurs edged through to the next round
Tottenham manager  "The best team lost
 The best team on the pitch lost
 If you look at it in a pragmatic way, forgetting that they had their best players, they had their full team, they had one more day to rest, we were really in trouble
"We were in real, real trouble to build a team, lots of fatigue after the match against Manchester City
 if you forget these important items and you analyse in a simple pragmatic way, the best team lost
"They were the best team, but I cannot forget all the other circumstances, and my players, they were phenomenal
 The way they react was fantastic
 They showed incredible heart and had a great connection with the crowd
"Saints boss : "It's nice that he praises us, but it doesn't help me
 Not every game of football is about being the better team, it is about being the winning team
 And we're not
"It is easy for him to praise us
 They were more clinical because in the last 15 minutes they turned the table in the way that is part of a good team
 We couldn't defend how we wanted to because this is very disappointing for me
 Being strong for 75 minutes is not enough
"Tottenham embark on their mid-season winter break before returning to Premier League action at Aston Villa on Sunday February 16, live on , at 2pm
Southampton also enjoy a pause before resuming their league campaign at home to Burnley on Saturday, February 15; Kick-off at 12
30pm
<PAD>
<PAD>
<PAD>
<PAD>
<PAD>
<PAD>
<PAD>
<PAD>
<PAD>
<PAD>
<PAD>
<PAD>
<PAD>
<PAD>
<PAD>
<PAD>
<PAD>
<PAD>
<PAD>
<PAD>
<PAD>
<PAD>
<PAD>
<PAD>
<PAD>
<PAD>