It was all about the right attitude as Harlequins made it six from six in Pool 3 and put themselves in with the chance of being the best ranked Pool winner with a battling 16-9 victory against Biarritz Olympique at a rain-soaked Parc des Sports Aguilera.
Chris Robshaw's team are guaranteed a home tie in the quarter-finals and only Toulon and ASM Clermont Auvergne can now deny them top ranking.
"It was a mature performance and we are delighted with the attitude of the players," said Director of Rugby Conor O'Shea.
"There was a lot of experience out there of playing together and in tough conditions but it was one of those nights when you had to roll the sleeves up and show as a group what it means to play for each other. We had to grind it out.
"We knew the kicking duel would be crucial and Nick Evans, Danny Care and Mike Brown kept us playing in the right areas.
"To come to the south of France and get a win against any team is outstanding especially given that's only the second time in the Heineken Cup that Biarritz have been beaten here.
"That was the motivation for the players as well as aiming to be number one seeds for the quarter-finals which could be important.
"Momentum is great in rugby and it was good to carry on the winning habit. It's also great for the fans who came out to watch us and all those back home who now have something special to look forward to. There's a lot of rugby to be played before the quarter-final but we're looking forward to April."
The directors of ERC voted unanimously at a Board meeting to postpone all decisions including the release of further instalments of ERC's distributable central revenues to the six shareholder countries until 19 February next when the Board will meet again to reconsider the issue.