Racing led the European Rugby Challenge Cup quarter-finalists 22-0 at the break thanks to a brace of tries from full-back Brice Dulin and one from centre Henry Chavancy.

The two-time Champions Cup runners-up managed to keep Castres off the scoresheet again in the second period while adding a further try from lock Teddy Baubigny.

Racing’s Heineken Champions Cup quarter-final opponents are ASM Clermont Auvergne, who also recorded a domestic success on Saturday, seeing off Stade Francais Paris 29-19 thanks to tries from Jake McIntyre and Peceli Yato, plus 10 points from fellow replacement Greig Laidlaw.

The other French Heineken Champions Cup quarter-finalist, Toulouse, continued their winning ways as well with a 22-14 home success against Bordeaux-Begles at Stade Ernest Wallon.

Fly-half Thomas Ramos – who has already chalked up 61 points in the Heineken Champions Cup this season – notched a try, two conversions and a penalty for Toulouse, with flanker Albin Placine and wing Cheslin Kolbe scoring Toulouse’s other tries.

The English sides left in the Heineken Champions Cup didn’t fare as well as the French trio, with all three suffering domestic losses at the weekend.

Northampton Saints succumbed 20-16 at home to London Irish on Friday, Exeter Chiefs narrowly failed to turn round a 22-5 half-time deficit to Sale Sharks at Sandy Park on Saturday, going down 22-19, and Saracens were thrashed 41-14 by Harlequins on Sunday at Twickenham Stoop.

Heineken Champions Cup quarter-finalists Racing 92 showed off their credentials at the weekend with an impressive 27-0 win at Castres Olympique in the TOP 14.