Harlequins cemented their position at the top of Pool 3 after recording a 30-22 victory over Connacht yesterday.
In an entertaining opening half, it was the visitors who led 24-19 at the break after a double from England international Danny Care with the rest of their points coming from the boot of Ben Botica.
The Irish province had taken a 19-9 advantage through Dave McSharry's converted try and four Dan Parks' penalties. Despite the second-half being a slightly more disappointing affair, the visiting stand-off added two further three-pointers to Parks' one to seal the win.
Connacht famously ousted Quins from the competition last season after defeating the English team 9-8 in windy conditions. They hinted at a similar outcome in the early exchanges.
Although Botica continued his fine kicking form from last week with a third minute penalty, McSharry touched down for the hosts.