Tottenham thrashed sorry Southampton 5-0 at St. Mary's in a confidence-boosting win ahead of the midweek Carabao Cup quarter-final against Manchester United and next Sunday's meeting with Liverpool.James Maddison scored at the start and finish of the first half, putting Spurs in front after just 36 seconds and adding a fifth deep into stoppage time.In between, Heung-min Son, Dejan Kulusevski and Pape Matar Sarr also punished an abject Saints, prompting the home fans to openly turn on boss Russell Martin.