Ospreys suffered a record Heineken Cup defeat as Stade Francais boosted their hopes of reaching the quarter-finals.
HEINEKEN CUP POOL THREE
Stade Francais: (24) 45:
Tries: Penaud, Skrela, Hernandez, Kayser, Montes (2), Rabadan.
Cons: Skrela (2), Hernandez (3).
Ospreys: (3) 10:
Tries: M Jones.
Cons: M Jones.
Pens: S Connor.
Stade finish second in Pool Three, but their seven tries improves their chances of a best runners-up spot.
Tries from Benjamin Kayser, Juan Martin Hernandez, David Skrela, Alain Penaud and Pierre Rabadan and Yohann Montes (two) secured a bonus-point win.
Matthew Jones' late converted try, adding to a Shaun Connor penalty, was no consolation for the young Ospreys.
Stade knew they had to rack up the tries against the Ospreys in Paris, and they had the bonus point in the bag by half-time.
Veteran fly-half Penaud got the Parisians on their way inside seven minutes after Sylvain Marconnet had his earlier attempt ruled out by the video official.
Skrela kicked the conversion and then grabbed the second after 24 minutes, following devastating work by the Stade scrum, when he burst through Richard Mustoe's tackle to score in the right corner.
Fly-half Shaun Connor got the Ospreys off the mark after half an hour with his third attempt at goal, but it was a brief interlude in French flood.
Hernandez evaded Andy Newman's grasp after running onto Skrela's clever cross-field kick before hooker Kayser secured the bonus point and a 24-3 half-time lead.
Ospreys managed to stem the tide as Stade rung the changes to their line-up, but it was replacement Montes who broke the deadlock as he crashed over after 59 and 71 minutes.
Ospreys replacement Matthew Jones at least gave his side some respectability when he charged down Hernandez's clearance to score five minutes from time.
But Stade had the final say when Rabadan was shoved over by the full weight of Stade's pack to round off an emphatic victory.
Ospreys coach Lyn Jones:
"We're obviously very disappointed with the result but you have to say that the better team won on the day.
"We always knew this would be a very big challenge with Stade pushing to make the last eight and that's exactly what it was."
Stade Francais president Max Guazzini:
"I am very proud of my players who were very professional and did the job that was required tonight against the Ospreys.
"They did exactly what had to be done in scoring many tries. Unfortunately whether it is enough to qualify for the quarter-finals is unsure.
"We will certainly have regrets regarding the first game against the Ospreys at their stadium and of course the defeat at Leicester last week."
Stade Francais: Hernandez; Corleto, Skrela, Messina, Dominici; Penaud, Fillol; Marconnet, Kayser, De Villiers, Auradou (capt), James, Rabadan, Martin, Sowerby.
Replacements: Parisse for Martin (27), Williams for Fillol (47), Sarramea for Skrela (47), Blin for Kayser (56), Montes for De Villiers (56), Marchois for James (63).
Not used: Bergamasco.
Ospreys: Cashmore; Terblanche, Parker, Davies, Mustoe; Connor, Rees; D Jones (capt), Hibbard, A Jones; Newman, Bateman; Bater, Beach, Thomas.
Replacements: A. Bishop for Davies (51), Wells for Rees (55), Griffiths for A Jones (60), M. Jones for Connor (64), Bennett for Hibbard (67), Millward for D Jones (77).
Not used: Tandy.
Referee: Chris White (England)