Here are Alasdair’s thoughts on that first half
For long periods this was an uninspiring half from Tottenham with no rhythm to their play but a little bit of magic from Tanguy Ndombele gave Spurs belief going into the break.
With a system that was constantly switching from 4-1-4-1 to a 4-2-3-1, neither were really working with a disjointed midfield, with Winks and Hojbjerg again looking like an uncomfortable pairing.
Both sides have ‘goals’ ruled out by VAR, Son’s a tight call, but when Saints’ opener came it was of course involving Kyle Walker-Peters and Danny Ings.
The former Spurs right-back played a terrific ball between the lost Dier and Sanchez and Ings, a player Tottenham would love to sign, buried it clinically.
It didn’t look like the visitors were going to find a way back into the half with their muddled forays forward only for Ndombele to enter stage left.
Perhaps fired up by a yellow card just moments later, he unleashed a Dembele-esque pirouette in his own half, showing real fight to perform it while being knocked to the floor and then he sent Kane clear.
He in turn played a deep ball to Son which caught the keeper in two minds and he fired home.
It’s been a disjointed first half but the goal came at the perfect time for the away side.
Mourinho now needs to tweak the system to ensure Ndombele can do more of what he’s good at while not picking up another yellow card. We might see Giovani Lo Celso before too long.