Two-time former champions Saracens maintained their 100 percent record and cemented top spot in Pool Three.
However, they were left frustrated with the 26-14 win over Cardiff Blues at Arms Park on Saturday.
Despite trailing 13-14 at the half-time break, the English club kept their opponents scoreless in the second half to take control of the pool.
“I thought we came out second half and took it them a little bit more,” flyhalf Owen Farrell said in his post-match reaction.
“[In the] first half we were too nice and didn’t care.
“Cardiff has been a tough team these past two weeks and credit to them but we’ll be frustrated for not putting a complete performance together.
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“Credit to the forwards there, they put in a big shift.
“We’re not saying it’s not tough to come here to win, they’re a top, top team, but in terms of how we’ve performed, the first half wasn’t good enough.”
A successful penalty kick from Owen Farrell extended their advantage’, but Cardiff hit back through a well-worked move off the scum – with centre Rey Lee-Lo crossing over. Anscombe added the extras to further reduce the deficit.
Farrell stretched Saracens’ lead with a penalty once more, but it was Cardiff that went into the break ahead.
Farrell scored two penalties to put the English side back ahead after the break, but when lock Will Skelton was sent to the bin, Cardiff sniffed an upset in front of a home crowd.
However, Saracens used all their experience to hold off the Blues and Jamie George ensured they travelled back to London with their unbeaten record in tact, scoring a try from a line-out.
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