Stade Franšais provisionally moved to the summit of the Top 14 standings on Friday thanks to a convincing 32-6 victory over defending champions Castres.
The Parisians scored three unanswered tries in the second half to secure a deserved bonus point.
Stade Franšais led 12-6 at the end of an error-riddled first half thanks to four penalties from Springbok fly-half MornÚ Steyn while Rory Kockott slotted two three-pointers for the visitors.
But it was one-way traffic after the break as Stade Franšais lifted the tempo in impressive fashion to underline their title credentials.
Fijian flyer Waisea Vuidarvuwalu touched down twice after fellow winger Julian Arias crossed for the game's first try.
The result moves Stade tow points clear of Clermont, who visit Bayonne on Saturday while Castres are six points off the pace.
For Stade Franšais:
Tries: Arias, Vuidarvuwalu 2
Pens: Steyn 5
Yellow cards: Kockott, Wihongi
Stade Franšais: 15 Hugo Bonneval, 14 Waisea Vuidarvuwalu, 13 Geoffrey Doumayrou, 12 Meyer Bosman, 11 Julian Arias, 10 MornÚ Steyn, 9 Julien Dupuy, 8 Sergio Parisse (capt), 7 Pierre Rabadan, 6 Scott Lavalla, 5 Gerhard Mostert, 4 Anton van Zyl, 3 David Attoub, 2 Remi Bonfils, 1 Heinke van der Merwe.
Replacements: 16 Michael Van Vuuren, 17 Zak Taulafo, 18 Carl Weger, 19 David Lyons, 20 Jerome Fillol, 21 Jules Plisson, 22 Digby Ioane, 23 Davit Kubriashvili.
Castres: 15 Geoffrey Palis, 14 Marcel Garvey, 13 Romain Cabannes (c), 12 Remi Lamerat, 11 Remi Grosso, 10 Daniel Kirkpatrick, 9 Rory Kockott, 8 Piula Faasalele, 7 Yannick Caballero, 6 Ibrahim Diarra, 5 Rodrigo Capo Ortega, 4 Richie Gray, 3 Karena Wihongi, 2 Brice Mach, 1 Saimone Taumoepeau.
Replacements: 16 Mathieu Bonello, 17 Mihaita Lazar, 18 Benjamin Desroches, 19 Janni Bornman, 20 Cedric Garcia, 21 Seremaia Ba´, 22 Max Evans, 23 Anton Peikrishvili.
Venue: Stade Jean Bouin, Paris
Referee: Laurent Cardona