Tottenham get a hard-fought win against Southampton to progress to FA Cup fifth round
Spurs went ahead when Tanguy Ndombele’s shot deflected in off visiting defender Jack Stephens before Shane Long made it equalized after Nathan Redmond’s effort had been parried by Hugo Lloris.
Danny Ings curled a shot past Lloris to put the Saints ahead in the 72nd minute but Lucas Moura equalised with a strike from 18 yards in the 78th minute.
Spurs eventually won the tie when Son Heung-min converted an 87th-minute penalty.
The South Korean had been fouled by Southampton goalkeeper Angus Gunn after a fine pass from substitute Dele Alli had created the opportunity.
Spurs will host Norwich City in round five in a midweek match to be played earlier in March.