Saracens' only first half points came from the boot of fly-half Owen Farrell.
BBC: Bath 13-17 Saracens
2.
However, the Ulster fly-half's boot continued to cause problems for the home defence, the pressure from his high kicks telling as it led to the 71st minute scrum at which the hosts were penalised.
BBC: Scarlets 16-16 Ulster
3.
O'Gara cut the gap with a fourth penalty with 12 minutes to go and the Ireland fly-half's trusty boot put the ball on a plate for Tuitupou in the final seconds.