Fin Smith's last-second penalty snatched a breathless 41-38 victory for Prem Rugby leaders Northampton Saints against second-placed Bath at Franklin's Gardens.
A last-minute try by England fly-half Fin Smith saw Northampton Saints snatch a thrilling 35-28 victory over Exeter Chiefs at Sandy Park on Saturday afternoon.
Former England lock Joe Launchbury will retire at the end of the season.
Sale hooker Nathan Jibulu has received a six-week ban for biting Harlequins prop Will Hobson.
Bristol's Gallagher Prem play-off hopes were dealt a major blow after they suffered an 18-14 defeat against struggling Harlequins at the Principality Stadium.
Northampton returned to the top of the Gallagher Prem table despite a disjointed display in a narrow 28-27 victory over battling bottom side Newcastle.
Noah Caluori scored four tries as Saracens overwhelmed Newcastle 73-14 at StoneX Stadium.
Harlequins defied their abysmal domestic form to stun La Rochelle 27-17 at Stade Marcel Deflandre and secure home advantage in the Champions Cup round of 16.
Northampton Saints were brought back down to earth after they suffered a 50-28 loss away to Champions Cup holders Bordeaux in a repeat of last season's final.
Bath lost a 26-point lead in an epic south-west derby only to snatch back victory in the most dramatic fashion in the closing seconds to beat Exeter 33-26, before Northampton Saints returned to the top of the Prem table.
Sale emphatically ended a run of four straight Prem Rugby defeats by thumping fellow strugglers Harlequins 43-17 in a bonus-point win at the CorpAcq Stadium in Salford.
Munster bounced back from a disappointing defeat to Bath last week to comprehensively beat Gloucester 31-3 in the Champions Cup at Páirc Uí Chaoimh in Cork.
An astonishing start which saw Bath 28-0 ahead inside 19 minutes proved crucial as the Prem side saw off Munster 40-14 in their Champions Cup opener.
Gloucester beat Harlequins 26-15 at Kingsholm to record their first Prem win of the season at the sixth attempt.
Leicester Tigers eked out a 36-35 win against Sale Sharks as Bath, Harlequins and Exeter all won by big scorelines in Saturday's Gallagher Prem action.
Marcus Smith's return inspired Harlequins to their first win of the Prem season as Saracens saw their perfect start come to an end with a 20-14 loss at The Stoop.
Leicester staged an incredible fightback to beat Harlequins, whilst Exeter beat Newcastle, and Saracens took control of Bristol.
Is Marcus Smith at risk of being overlooked as a starting British and Irish Lion this summer in Australia?
London Irish administrator Lee Manning says it is only "a matter of time" until the next Premiership club goes bust and that "radical change" is needed.
Danny Care chats to Sky Sports about England highs and lows, his incredible longevity in the sport and despair at never becoming a British and Irish Lion.