Two tries from Danny Care set Harlequins on their way to a deserved 30-22 Heineken Cup victory over Connacht at the Sportsground.
Dan Parks converted David McSharry's seventh-minute try and added four penalties to move the hosts 19-9 ahead.
But Quins grabbed 15 points in the closing 11 minutes before the break, that profitable spell being crowned by Care's two shrewdly-taken tries.
Ben Botica, an excellent replacement for Nick Evans against Biarritz in the opening round, landed an injury-time penalty to complete a 24-19 turnaround by the interval.
Botica turned in another dazzling place-kicking display with a 20-point haul, as two further three-pointers from him killed off Connacht's doughty challenge.