Tigers, Sarries and Saints win
Leicester ended London Irish's winning run in the Aviva Premiership on Sunday, while Northampton retained top spot and Saracens saw off Exeter.
The Tigers had to withstand some huge pressure from Irish in the dying minutes but just held on to record a deserved 20-15 victory by scoring three tries to none.
The win raised the Tigers into fourth position in the league, moving above Harlequins as it becomes increasingly likely that those two sides will contest for the final play-off place.
Irish were aiming to record their fourth consecutive win in the Premiership but after an even first half, they fell away as Leicester became more dominant.
Two first-half tries from full-back James Wilson set league leaders Northampton on the road to victory in their clash at struggling Newcastle.
Despite being shorn of their international stars, Saints still looked a different class as they dealt with the blustery wind and heavy Kingston Park pitch and ran out 22-16 winners.
Newcastle snatched a losing bonus point with a Noah Cato try two minutes from time.
Tries from James Johnston and Schalk Brits helped second-placed Saracens overcome Exeter 23-10 in their Premiership clash at Allianz Park.
Both were converted by former England fly-half Charlie Hodgson, who also kicked three second-half penalties in the 23-10 home win.
Exeter, who had taken the lead with a try by centre Ian Whitten, suffered their fifth successive Premiership defeat.
Their other five points came from the boot of fly-half Gareth Steenson.