Tottenham, managed by Mourinho, won a bad-tempered Premier League affair against 10-man Manchester City, managed by Mourinho’s arch rival, Guardiola, to boost their top-four hopes.
The result lifts Spurs to fifth, four points behind fourth-placed Chelsea, while City remain second, 22 points behind leaders Liverpool who can win the title on 21 March when they play Crystal Palace.
22-year-old Steven Bergwijn’s goal came with Spurs’ first shot on target, after Oleksandr Zinchenko had been dismissed for a second yellow card and City midfielder Ilkay Gundogan had seen a first-half penalty saved by Hugo Lloris.
Son Heung-min’s effort, which deflected off Fernandinho as it flew past City goalkeeper Ederson into the bottom left corner confirmed a valuable victory for the hosts.
Pep Guardiola’s City side had arrived in London chasing their fifth league win in six games and dominated possession but failed to convert a glut of glorious chances.
Lloris brilliantly flicked a Sergio Aguero effort on to the post and the Argentine was then at the centre of a chaotic few minutes towards the end of the first half, winning a penalty awarded by VAR following Serge Aurier’s clumsy challenge.
Gundogan however, saw his spot-kick – which took four minutes to be given – saved by Spurs keeper Lloris, with VAR then asked to rule on whether the France goalkeeper had fouled City’s Raheem Sterling as both pursued the rebound.
Tottenham’s Toby Alderweireld and Zinchenko were booked as both sets of players confronted each other in the aftermath, while Spurs boss Jose Mourinho appeared angered at the referee’s failure to book Sterling for diving when a second penalty was not awarded.
Sterling had earlier appeared fortunate to escape with only a 12th-minute booking, after replays showed his studs landing on the ankle and lower shin of Spurs midfielder Dele Alli.
City though were reduced to 10 men after the break, with Ukrainian Zinchenko receiving his marching orders for a foul on Harry Winks.
That allowed Spurs to gain a foothold in the game, with Bergwijn firing Lucas Moura’s clever cross into the bottom right corner from 15 yards to set them on their way.