Leicester ended Bath's five-match winning streak in the English Premiership with a 17-8 victory at Welford Road on Sunday.
Hooker Tom Youngs scored the Tigers' only try with flyhalf Owen Williams kicking four penalties.
The result sees Leicester move to fifth on the table after 12 rounds, behind Wasps, who thrashed Sale 41-16 in Coventry, on points difference.
Sunday's other match saw Harlequins have to work hard for a 24-13 bonus-point win against London Welsh in Oxford.
On Saturday, Saracens claimed a 22-6 win over London Irish at Allianz Park, with winger David Strettle scoring a try in each half. The Sarries players wore impact sensors during the match as part of the club's ground-breaking programme to determine the effects of concussion on rugby players. The gadgets measure the force and direction of impact to the head, and are taped behind the ear lobe.
In Saturday's other match, Gloucester edged the Exeter Chiefs in an epic contest at Sandy Park, while Northampton beat Newcastle 39-31 on Friday night to stay at the top of the log with 48 points. Bath (42) remain second, with Saracens (38) third.
Round 12 results:
Northampton 39 Newcastle 31
Saracens 22 London Irish 6
Exeter 25 Gloucester 26
Leicester 17 Bath 8
Wasps 41 Sale 16
London Welsh 13 Harlequins 14
Photo: David Rogers/Getty Images