Cardiff Blues made it two wins from two in the Challenge Cup after holding out to defeat Toulouse 17-15 in a seesaw contest at the Stade Ernest Wallon.

Nick Williams' try plus Jarrod Evans' conversion and penalty gave the Welsh side a 10-3 advantage after the first quarter but Romain Ntamack and Antoine Dupont dotted down before the interval to give Toulouse a 15-10 half-time lead.

Macauley Cook's 51st-minute try was converted by Evans, and - although Cardiff were unable to give themselves a cushion - they held on to secure what could prove to be an important victory.