Wasps' Heineken Cup hopes are hanging by a very thin thread after a shock 20-10 loss against Glasgow at Firhill Stadium on Sunday.
Needing a victory to stay hot on the heels of Toulouse ahead of next week's crunch Pool Six clash, Wasps' failure to pick up a bonus point means they are six points behind the French side's 21 with just one match to go.
Their only hope of qualifying for the next round is by beating Toulouse and going through as one of the best second-placed teams.
Wasps were sloppy for most of the afternoon, but their hosts didn't give them breathing space right from the first minute and they kept the pressure on for the rest of the match.
After Ruaridh Jackson and David Walder traded penalties, Wasps scrum-half Joe Simpson opened things up with a sniping run from the base of the scrum just outside the 22. His floating pass found Tom Vandell who ran over for the first try.
Everyone thought it was the start of a procession, but the Warriors proved they were up for it and Jackson kept them within striking distance with another penalty after 15 minutes.
The home side frustrated Wasps for long periods late in the first half and at times outplayed their much more fancied opponents, annihilating the Wasps scrum on a couple of occasions.
The pressure eventually paid off in the second half when a spill from hooker Tom Lindsay allowed them to set up a counter attack. Wing Colin Shaw did the hard yards and his pop pass sent scrum-half Colin Gregor over as Glasgow took a 14-10 lead.
Things got even messier for Wasps after that with some sloppy knock-ons and a couple of penalties. Joe Worsley gave the Warriors an opportunity to stretch the lead to seven points after a high tackle on Gregor and Jackson accepted it.
The spectators waited for a response from the visitors as their hopes slipped away, but it never came and Jackson gave Glasgow a 10-point cushion with a drop four minutes from time and Wasps never had an answer.
Man of the match: He not only scored the try to put Glasgow's noses in front, but Colin Gregor had an outstanding all-round game.
Pens: Jackson 4
Drop Goal: Jackson
For London Wasps:
Glasgow: 15 Bernardo Stortoni, 14 Colin Shaw, 13 Federico Aramburu, 12 Pete Murchie, 11 Hefin O'Hare, 10 Ruaridh Jackson, 9 Colin Gregor, 8 Ryan Wilson, 7 Richie Vernon, 6 Rob Harley, 5 Alastair Kellock, 4 Richie Gray, 3 Moray Low, 2 Dougie Hall, 1 Ryan Grant.
Replacements: 16 Pat MacArthur, 17 Kevin Tkachuk, 18 John Welsh, 19 Alastair Muldowney, 20 Chris Fusaro, 21 Henry Pyrgos, 22 Peter Horne, 23 David McCall.
Wasps: 15 Mark van Gisbergen, 14 Tom Varndell, 13 Ben Jacobs, 12 Riki Flutey, 11 David Lemi, 10 Dave Walder, 9 Joe Simpson, 8 Andy Powell, 7 Serge Betsen, 6 Joe Worsley, 5 James Cannon, 4 Simon Shaw, 3 Zak Taulafo, 2 Tom Lindsay, 1 Tim Payne.
Replacements: 16 Michael Mayhew, 17 Charlie Beech, 18 Ben Broster, 19 Marty Veale, 20 Richard Birkett, 21 Nic Berry, 22 Dom Waldouck, 23 Richard Haughton.
Referee: James Jones