Tottenham needed a late rescue act in their FA Cup fourth round replay against Southampton to book their spot in the fifth round as they clinched a 3-2 win over a Saints side who saw Shane Long get onto the scoresheet.
Jose Mourinho's men looked to be heading out of the competition with less than 20 minutes remaining as Saints goals from Republic of Ireland striker Long and Danny Ings overturned an early Jack Stephens own goal.
Spurs rallied when they needed to, though, with Lucas Moura and Son Heung-min - the two men asked to step up in the absence of Harry Kane - scoring the goals that sets up a home tie with Norwich next month.
A quarter-final spot will be at stake in that match and Mourinho will be viewing this competition as a great chance to get some early silverware at Spurs.
There was a sad moment for Spurs as Jan Vertonghen appeared close to tears after being tactically substituted in the second half.
The 32-year-old, who is out of contract in the summer, has been exposed on a number of occasions this season and had the look of a man who knows his days at Spurs could be numbered.
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.
Spurs manager Mourinho also felt Southampton were the better side but he praised the attitude of his players.
Mourinho told BT Sport 1: "I have to be honest, I think the best team lost.
"But the team with more heart, the team that went to their limits, the team that had so many difficulties even to build a team, that team that did not have options to change the game.... my team deserved to win.
"The best team lost but my team deserved to win. From the beginning I could feel immediately by the intensity levels, condition, freshness, they were much stronger than us.
"We tried to build the puzzle but some pieces were missing. But we fought to our limit."