It's all to play for in the second leg of the Anglo-French European playoff as London Wasps edged Stade Francais 30-29 on Sunday.
A late Andy Goode penalty handed the hosts the narrowest of victories in a game that featured seven tries.
Stade started the brighter, scoring the first of the five-pointers through prop Zak Taulafo, converted by Julien Dupuy, to Goode's early penalty.
But Wasps soon found their groove, as converted tries from Tom Varndell and Ashley Johnson, plus a second Goode penalty gave them a commanding lead early in the second half, with Djibril Camara touching down for the visitors.
It was an incredibly tense final quarter in the Adams Park sunshine, as Goode converted a brilliant solo try from Joe Simpson before Jerome Fillol fought back with seven points of his own courtesy of a charge-down.
Nayacalevu Vuidravuwalu looked to have handed Stade victory as they led by two points thanks to his converted try late on, but it was Goode's final act that gave Wasps the slenderest of aggregate margins to take to Paris.
Tries: Varndell, Johnson, Simpson
Cons: Goode 3
Pens: Goode 2
Yellow card: Haskell
Tries: Taulafo, Camara, Fillol, Vuidravuwalu
Cons: Dupuy, Fillol 2
London Wasps: 15 Andrea Masi, 14 Will Helu, 13 Elliot Daly, 12 Chris Bell (c), 11 Tom Varndell, 10 Andy Goode, 9 Joe Simpson, 8 Nathan Hughes, 7 James Haskell, 6 Ashley Johnson, 5 Tom Palmer, 4 Joe Launchbury, 3 Phil Swainston, 2 Carlo Festuccia, 1 Matt Mullan.
Replacements: 16 Tom Lindsay, 17 Simon McIntyre, 18 Taione Vea, 19 Kearnan Myall, 20 Guy Thompson, 21 Brett Sheehan, 22 Joe
Carlisle, 23 Charlie Hayter
Stade FranÃ§ais: 15 Hugo Bonneval, 14 Julien Arias, 13 Waisea Vuidravuwalu, 12 Meyer Bosman, 11 Djibril Camara, 10 Morne Steyn, 9 Julien Dupuy, 8 David Lyons, 7 Sylvain Nicolas, 6 Antoine Burban, 5 Pascal Pape, 4 Alexandre Flanquart, 3 Rabah Slimani, 2 Laurent Sempere, 1 Zak Taulafo.
Replacements: 16 Olivier Panis, 17 Heinke van der Merwe, 18 Davit Kubrishvili, 19 Anton van Zyl, 20 Scott Lavalla, 21 Jerome Fillol, 22 Jules Plisson, 23 Jeremy Sinzelle
Referee: John Lacey (Ireland)