FT: Northampton 15-20 Wasps
FT: Harlequins 17-10 Saracens
FT: Gloucester 13-18 Newcastle:
FT: Worcester 34-34 Sale Sharks
Well, what an afternoon of action that was.
Plenty of talking points and surprises too. You can read all about it on the rugby unions page of the BBC Sport website.
We'll be back tomorrow with the final action from round four between Leicester and Bath.
Join us then - for now, we'll leave the final word with the day's headline-makers Harlequins who defeated last season's champions Saracens.
Image source, Rex Features
Image source, Rex FeaturesWell, caught your breath after all that action?
We'll wrap things up and remind you of the scores shortly....
Northampton 15-20 Wasps
The answer is no and yet again it's a knock-on that scuppers Northampton.
That's sadly characterised their performance today, but for Wasps, they have won four from four and will go top of the table tonight.
Clock's in the red, but Saints have taken the restart.
Can they run in a huge winner from their own half?
Northampton 15-20 Wasps
Northampton take a chance for a losing bonus point at least and Stephen Myler kicks over three points.
Could they even steal this with 15 seconds to play?
Worcester 34-34 Sale
In an epic finish, Worcester do enough to hold on for a draw against Sale Sharks.
Sharks were down 31-17 in the second half, but tries from Neil Briggs and Halani Aulika helped the visitors square things up at Sixways.
Northampton 12-20 Wasps
And the try is given after a review. Josh Bassett has scored it and in the build-up, there's also a yellow card for Ken Pisi as he's been judged to have unfairly tripped Dan Robson.
Wasps broke away there after a couple of knock-ons and they reacted quicker to the chance of a counter-attack.
Jimmy Gopperth adds the conversion.
Saints on the charge once more. Wasps down to 14 men, can they hold on?
Gloucester 13-18 Newcastle
And the first game of the afternoon comes to an end, with Newcastle triumphing over Gloucester at Kingsholm.
That is Falcons' second win of the season and first in the Premiership at Kingsholm since 2012.
Gloucester's media team have not minced their words with this tweet, apologising to fans.
Northampton 12-13 Wasps
And it didn't take long for Saints to capitalise on that man advantage.
Tom Kessell is able to barge the ball over from three metres out as he takes a cheeky opportunist try from the base of the ruck.
Stephen Myler adds the extras.
We're a one-point game with less than five minutes to play...
Harlequins 17-10 Saracens
Ruaridh Jackson make the vital final turnover and as Craig Maxwell-Keys' whistle blows the Twickenham Stoop erupts with glee.
Harlequins have beaten Saracens and have ended the reigning champions 13 match winning run in all competitions.
Northampton 5-13 Wasps
Referee Luke Pearce has had enough of Wasps infringing at the maul and he shows Nathan Hughes a yellow card.
Wasps have got to play this out with just 14 players....
More Saints pressure in the Wasps 22, but still the visitors have enough to keep them out.
Penalty conceded and Saints go for the catch-and-drive....
Harlequins 17-10 Saracens
Ben Spencer, who is onto the field at scrum-half, has taken over the kicking duties and his first kick sails through the uprights.
There's now three minutes left to play and Saracens are within a converted try of their hosts.
Nervous times for Harlequins and their fans!
Worcester 34-34 Sale; Gloucester 13-18 Newcastle
Just a few minutes remaining in the other matches, and we have a few crackers.
Alan MacGinty converts a late try from Halani Aulika and AJ MacGinty converts to make it 34-34. Thrilling stuff at Sixways.
At Kingsholm, Greig Laidlaw lands a penalty to reduce the arrears for Gloucester. They are now 13-17 behind against Newcastle.
Harlequins 17-7 Saracens
Saracens have kicked for the corner and now it's a real test for Harlequins defence.
We've got five minutes left to play and James Horwill is given a yellow card... are we going to get a box office finish? Harlequins will have to try and hold on with 14 men
Knock-on again by Northampton!
They've let themselves down in the final phase today. Courtney Lawes is the latest to spurn an attacking move from the hosts.
Stephen Myler chose the short pass to the second row instead of floating it out wide where there were numbers, including George North.
Into the closing stages at Franklin's Gardens and this one could still go either way.
Northampton keep banging on the door and Wasps have the answers in defence.
They also have the threat on the counter to put this one to bed, Nathan Hughes among them.
Image source, Getty ImagesHarlequins 17-7 Saracens
We're into the final ten minutes and there's a touch of panic creeping in for Saracens right now.
Harlequins have the ball in their hands and are looking to extend their lead.