Alli curls in stunning goal from 25 yards for Spurs
Dier smashes in from 18 yards to double lead
Son slots in third from 25 yards and fourth with fine half-volley
Kane returns from injury as second-half sub
We shall see.
That's all from me for now though. If you're just joining in, feel free to catch up on it all below.
Head over here for reaction, and build-up to all of Saturday's games.
Until the next time!
Image source, Getty ImagesRight then, what can Chelsea do at Bournemouth this afternoon? That's what it comes down to.
Four points, their lead has been cut down to with that Spurs win. Is the title race truly back on?...
Tottenham 4-0 Watford
John Hartson
Ex-Wales striker on BBC Radio 5 live
Very convincing from Spurs and they're making a fist of the title race. They're not wobbling and the onus is on Chelsea to go and win this afternoon.
Tottenham 4-0 Watford
Tottenham 4-0 Watford
One last hurrah? Harry Kane is lining up a free-kick... Decent position. He's gonna blast one...
It smashes off the bar!
Tottenham 4-0 Watford
THREE minutes stoppage time.
Tottenham 4-0 Watford
Spurs are moving within four points of Premier League leaders Chelsea. They've blown Watford away on the strength of those 11 first-half minutes. Three goals, which Son Heung-min added to after the break.
How long is added on? Watford will want this one done with sooner rather than later.
Image source, AFPTottenham 4-0 Watford
John Hartson
Ex-Wales striker on BBC Radio 5 live
I would use the word sensational for Son. Every time he's had the ball, other than his miss from that Harry Kane pass, he's been really, really good. A top class player and he gets a big bear hug from his manager.
Tottenham 4-0 Watford
Well the hat-trick just was not meant to be for Son Heung-min. Off he comes now, replaced by Josh Onomah, a 19-year-old midfielder. Job done.
Onomah's only on the bench because of Vincent Wanyama's injury in the warm-up.
Image source, Reuters#bbcfootball
Image source, Getty ImagesSimon Amos: Trippier has to be the best backup fullback in the league.
Dennis Ethan: Are Chelsea watching? Be warned! Spurs are piling on pressure :)
Sean McGreal: Pochettino has 'em purring. Nailed on CL football for Spurs next season at least.
Tottenham 4-0 Watford
Son Heung-min smashes against the bar after Kieran Trippier's ball forward - another excellent pass.
He just cannot get it in! The hat-trick really isn't meant to be...
Image source, ReutersTottenham 4-0 Watford
John Hartson
Ex-Wales striker on BBC Radio 5 live
Well this was the easiest chance of the goals he's scored. Kane unselfishly slips in Son and I can't believe he's missed. He can't believe it, Tottenham fans can't believe it and Harry Kane can't believe it. Kane says 'go on Son, go and get your hat-trick,' but he's put it wide.
Image source, ReutersTottenham 4-0 Watford
Hat-trick! It must be!
Harry Kane rolls a pass out to Son Heung-min, who just needs to keep his head and finish low for the treble. But he fires wide, with the goal at his mercy. Not to be?
Image source, ReutersTottenham 4-0 Watford
Another inch-perfect cross from Kieran Trippier but Harry Kane cannot connect - the ball just sails beyond his head. The striker launched himself at that. Brilliant effort, but couldn't quite make the telling contact to divert it home.
Trippier has been very good today.
Tottenham 4-0 Watford
Off comes Mousa Demeble, replaced by Moussa Sissoko.
Watford are still gamely pressing, but Spurs are just leaning back, waiting for another chance to strike.
Image source, ReutersTottenham 4-0 Watford
John Hartson
Ex-Wales striker on BBC Radio 5 live
Would five goals flatter Spurs? It's probably about right. Watford haven't really looked a threat. Lloris hasn't had a lot to do and Spurs have been outstanding, everybody all over the pitch.
Tottenham 4-0 Watford
Kieran Trippier lifts a ball over the Watford backline and Harry Kane gets his first taste of real action, rounds the keeper...
But the stab at goal is weak, he's off balance, and a yellow shirt is there to mop up.
Vincent Janssen would have buried that...
Image source, Reuters#bbcfootball
Image source, ReutersAnthony: Tottenham look a very very good side under Pochettino, the club should do everything in their power to keep him.
Simon Rigler: I chose Pedro over Son for FF team this week. And I'm a Cherries fan. Hindsight's wonderful of course, but d'oh!
Supeace Bro: I guess, its end of Vincent Janssen for spurs..... still hope i m wrong but...
Tottenham 4-0 Watford
Here comes Troy Deeney, on for Nordin Amrabat. An attacking move that - forward on for winger. They've got a goal in them you feel, Watford. At least one. Fair play for going after it.
Tottenham 4-0 Watford
A Watford corner is boomed clear by Harry Kane - who's hardly had a touch since coming on.
Spurs seem to be settling into seeing this out. Troy Deeney looks ready to come on for Watford as Hugo Lloris hooks a through-ball clear. They're edging back into this a little, the away side. But obviously, take a look at the scoreline...