Owen Farrell lands 19 points as Sarries beat Northampton 29-20
Earlier Wasps beat Exeter 25-24 with the final move of the game
Saracens and Wasps will now meet in the Champions Cup last four
5 English clubs made last eight - Leicester play on Sunday
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Wasps 11-14 Exeter
Here comes the mud! Exeter's ice white kits are no more. Get the detergent out.
The Chiefs earn a line-out near half-way, and the visitors work through the phases trying to build momentum.
It gathers pace, with Geoff Parling at the heart of it. Wasps hold them up for the time being but Exeter are only five metres out now.
Wasps 11-14 Exeter
Jeremy Guscott
Former England international on 5 live Sports Extra
"What a try! This is what we've all come to see. That was wonderful, magically worked by Wasps. It was a beautiful kick from Dan Robson - I thought the move had ended. But he had the vision to kick towards the corner and find Charles Piutau."
Wasps 11-14 Exeter
Image source, PAA special try from Wasps!
A little grubber kick from Dan Robson lands perfectly on the angle for Charles Piutau and the full-back races over to touch down in the corner.
Jimmy Gopperth has a hard conversion to take from the left-hand side and it drifts wide.
Waps 6-14 Exeter
Jeremy Guscott
Former England international on 5 live Sports Extra
"It is a misty drizzle that will make the ball like a bar of soap. The most intelligent side will come out on top. At the moment that is the Chiefs."
Wasps 6-14 Exeter
It's proper soggy at the Ricoh Arena. Proper, proper soggy.
And Lachie Turner is a victim of the weather. The Exeter full-back drops the ball from a high kick - scrum to Wasps.
It could be a messy half of rugby.
Wasps 6-14 Exeter
Jeremy Guscott
Former England international on 5 live Sports Extra
"Wasps are down but they are not a long way out. They need to change their attack, create a diversion with two lines so Exeter don't know where the quick ball is going to."
Wasps 6-14 Exeter
We're off again for the second half.
Will Wasps rescue their unbeaten home record this year and, more importantly, rescue their European hopes?
Stay tuned. It's going to be a good 'un.
#bbcrugby
Wasps 6-14 Exeter
Jeremy Guscott
Former England international on 5 live Sports Extra
"We will find out how this Wasps side can handle the pressure. It is almost 10 years since Wasps have been in this scenario. This side want to create their own legacy - they don't want to hear about the past great Wasps sides."
He led the England team for for four years before being cast aside after a World Cup display to forget last year.
And now Stuart Lancaster speaks for the first time in an exclusive interview with BBC Radio 5 live's Sportsweek programme.
You can listen to the full and frank chat with Lancaster from 09:00 BST on Sunday.
Image source, Getty ImagesWasps 6-14 Exeter
Wasps 6-14 Exeter
Image source, Rex FeaturesWasps' director of rugby Dai Young looks a bit fed up in the stands.
His side looked lively in the opening 20 minutes but Exeter eventually came into their own to take an eight-point lead.
Are the Chiefs heading for their first ever European semi-final? We'll know the answer in the next hour.
Wasps 6-14 Exeter
Jeremy Guscott
Former England international on 5 live Sports Extra
"A game of rugby is about the ebb and flow - and the flow is with the Chiefs. They need to retain that momentum and not let Wasps back in."
Wasps 6-14 Exeter
Exeter earn a scrum in their own half and Wasps are penalised for collapsing.
The ever reliable Gareth Steenson boots the ball into touch and it's a Chiefs line-out.
It's the last action of the first half, though, as Steenson clears the ball into the crowd. Forty minutes up on the clock.
Wasps 6-14 Exeter
Jeremy Guscott
Former England international on 5 live Sports Extra
"Wasps forcing it and that's what Exeter have made Wasps do. They forced the pressure. Wasps have got to regroup, be calm and patient, and believe their skill and execution can get the points back. They are far from being out of this game."
Wasps 6-14 Exeter
Image source, Getty ImagesThe TMO says Waldrom definitely crossed. Exeter extend their lead.
Great movement from the big man... although he did sort of belly-flop over in the end.
Gareth Steenson makes it two from two with the conversion.
Wasps 6-7 Exeter
Image source, Rex FeaturesLOOK OUT - Thomas Waldrom's at it again.
He intercepts a Wasps ball and goes charging for the line. The Wasps defence bring him down but it looks like he's slid over.
Wasps 6-7 Exeter
Jeremy Guscott
Former England international on 5 live Sports Extra
"For some inexplicable reason Exeter messed about with the ball instead of smashing it down the field. Silly, unnecessary, unforced from Exeter. They have got away with one."
Wasps 6-7 Exeter
Image source, Rex FeaturesJimmy Gopperth's long-range penalty looks good but it pings off the post, and Exeter retain their one-point advantage.
Wasps 6-7 Exeter
Jeremy Guscott
Former England international on 5 live Sports Extra
"Waldrom's unstoppable! As soon as he gets his hands on the ball 10 yards out they set that maul - it's an efficient machine.
"Disappointing for Wasps because they knew it was coming. But they couldn't do anything about it."