French giants Racing 92 thrashed the visiting Scarlets 64-14 at the Stade Yves du Manoir on Sunday, scoring nine tries.
A dominant half from Racing saw them score five tries – one each from Juan Imhoff, Antonie Claasen, Louis Dupichot and two from Casey Laulala.
Kiwi maestro Dan Carter also kicked 13 points, with Scarlets failing to register a single score.
Scarlets looked to have stemmed the tide with two quick tries from Van Der Merwe and Gareth Davies.
But, Racing weren't to be denied with four more tries. Imhoff, Laulala, Johan Goosen and a penalty try, along with six points from the boot of Brice Dulin, sealed a remarkable win.
After taking maximum points against Glasgow Warriors last weekend, it was no surprise that Racing opened the scoring with a penalty from the ever reliable boot of Carter.
The French side continued to press and were rewarded with a try from Imhoff after a lovely inside pass from Dupichot.
Matters worsened for Scarlets a few minutes later when second row Maselino Paulinho and Canadian international DTH van der Merwe were sent to the sin-bin in quick succession for dangerous tackles.
The Parisians finally took advantage of the two extra men when Laulala crashed over for the home sides second try of the game.
Thirteen men couldn't contain a relentless French attack, and their line was broken again when Claassen powered over the line just before the half-hour mark.
And the home side had the bonus point wrapped up before half time with a wonder score from French youngster Dupichot.
A sensational half from Racing was capped with a second try for Laulala to give the hosts a 38-0 lead at half-time.
Scarlets came out fighting in the second half and scored their first try through Van der Merwe two minutes after the break.
The Welsh resurgence continued when Mike Phillips was shown yellow for Racing, with Scarlets scrum-half Gareth Davies scoring a try from the resulting penalty.
Any Scarlets fire was extinguished shortly after when Racing forced a penalty try to re-establish their lead.
Racing continued their relentless assault when Imhoff scored his second and his sides seventh try.
The rout continued when Goosen went over for Racing to compound more misery on the Scarlets. Outside centre Laulala sealed his hat-trick in the final minute to cap an extraordinary scoreline and secure a home quarter-final for Racing.
Tries: Imhoff 2, Laulala 3, Claassen, Dupichot, Penalty Try, Goosen
Cons: Carter 5, Dulin 2, Goosen
Yellow Card: Phillips
Tries: Van der Merwe, G Davies
Cons: Shingler 2
Yellow Cards: Paulino, Van der Merwe
Racing 92: 15 Brice Dulin, 14 Louis Dupichot, 13 Casey Laulala, 12 Dan Carter, 11 Juan Imhoff, 10 Remi Tales, 9 Mike Phillips, 8 Antonie Claassen, 7 Bernard Le Roux, 6 Yannick Nyanga, 5 Manuel Carizza, 4 Luke Charteris, 3 Ben Tameifuna, 2 Dimitri Szarzewski, 1 Eddy Ben Arous
Replacements: 16 Camille Chat, 17 Julien Brugnaut, 18 Martin Castrogiovanni, 19 Thibault Dubarry, 20 Chris Masoe, 21 Maxime Machenaud, 22 Henry Chavancy, 23 Johan Goosen
Scarlets: 15 Mike Collins, 14 Steff Evans, 13 Regan King, 12 Hadleigh Parkes, 11 DTH van der Merwe, 10 Steven Shingler, 9 Gareth Davies, 8 Morgan Allen, 7 Aaron Shingler, 6 Rory Pitman, 5 Maselino Paulino, 4 George Earle, 3 Samson Lee, 2 Ken Owens, 1 Phil John
Replacements: 16 Kirby Myhill, 17 Wyn Jones, 18 Rhodri Jones, 19 Tom Price, 20 Tom Phillips, 21 Rhodri Williams, 22 Dan Jones, 23 Steff Hughes
Referee: Matthew Carley (England)
Assistant Referees: Ian Tempest (England), Wayne Falla (England)
TMO: David Grashoff (England)