Owen Farrell landed a penalty via both posts with the last kick of the game to earn Saracens a 28-26 win over Bath at the Recreation Ground.
The lead changed hands five times in the second half as Farrell's kicking regained the initiative for the Aviva Premiership champions only for Sam Vesty to edge Bath back in front with a penalty six minutes from time.
But with only seconds left on the clock, the Londoners won turnover ball and Brad Barritt attacked down the left to win the final penalty from referee Greg Garner. Farrell finished with a tally of 23 points.
The hosts won the try count 2-1 thanks to Nick Abendanon and Carl Fearns - James Short crossed for the visitors' score - but a losing bonus point will be of little consolation.
Jonny May and Tom Voyce crossed for tries as Gloucester picked up their first win of the season with a comfortable 29-8 derby victory over Worcester at Kingsholm.
The damage was done in the first half as a breakaway try from centre May and a conversion and four penalties from fly-half Tim Taylor put the Cherry and Whites into a 19-3 half-time lead, Joe Carlisle replying with a penalty for the visitors.
Replacement Freddie Burns added a further penalty and converted Voyce's late try during a scrappy second half as Bryan Redpath's side bounced back from their late defeat at Northampton last weekend.
Dale Rasmussen got a consolation try for Worcester but this was a reality check for boss Richard Hill, as his newly-promoted side came back down to earth with a bump following their win over Sale on the opening day.
Exeter, meanwhile, recorded a 32-15 victory over Newcastle at Sandy Park to go top of the table by a point.
Josh Tatupu, Sireli Naqelevuki, Phil Dollman and Jason Shoemark were the try-scorers for Exeter, with Tom Catterick and James Fitzpatrick crossing for the visitors.