Leicester Tigers maintained their Guinness Premiership title challenge with a pugnacious 6-13 win in Worcester on Saturday.
Leicester rested three of their forwards on Six Nations duty for England against Ireland next Saturday - hooker George Chuter, lock Louis Deacon and number eight Martin Corry - but Worcester could not take advantage.
Without a home league success since April 29, they again lacked the necessary cutting edge to slice open a defence as well-organised and physical as Leicester's, and a losing bonus point provided scant consolation.
Worcester's consistent failure to score tries has undermined their domestic campaign, and it will take a Herculean effort to avoid relegation now, especially with away games against title play-off contenders Gloucester, Sale Sharks and Bristol remaining on the fixture list.
Leicester, though, opened up a five-point gap at the Premiership summit over Bristol, who host struggling Newcastle on Sunday, despite never threatening to hit top gear.
Corry and his England colleagues wisely stayed at home, missing an error-strewn encounter which only occasionally flickered into life.
Leicester wing Seru Rabeni scored the solitary try, while fly-half Ian Humphreys slotted a conversion and two penalties to take Tigers past the half-century Premiership points mark.
They closed the game out despite late Worcester pressure, expertly guided home by England scrum-half Harry Ellis, who appeared as a 71st-minute substitute.
Both Ellis and England replacement prop Julian White, a starter in Leicester's front row, emerged unscathed from a typically attritional Premiership contest, which will be music to the ears of England head coach Brian Ashton.
Worcester lock Craig Gillies made his 100th Premiership appearance and Ryan Powell replaced suspended scrum-half Matt Powell, but both sides struggled for continuity after a three-week break from Premiership action, and Leicester relied on a route-one approach to blow open Worcester's defence.
Wing Alesana Tuilagi, whose power terrorised Worcester when he received the ball in space, smashed his way past Warriors hooker Chris Fortey and quickly-recycled possession saw Rabeni cross unopposed.
Humphreys added the conversion and kicked a penalty during first-half injury-time, but the interim period saw Worcester shade the territorial battle.
Rival scrum-halves Powell and Frank Murphy were sin-binned by referee David Rose following an off-the-ball skirmish, and Leicester soon found themselves reduced to 13 men after Drahm's opening penalty strike.
Tigers number eight Brett Deacon received a yellow card for an offence at a ruck, yet Worcester could only manage another Drahm penalty as they failed to breach Leicester's defence.
Humphreys' angled three-pointer gave Leicester a 10-6 interval advantage, and Worcester boss John Brain made a substitution within two minutes of the restart, sending on Wales prop Chris Horsman for Tevita Taumoepeau.
Horsman, though, immediately conceded a penalty, and Humphreys gratefully accepted the chance, leaving Worcester a converted try adrift for most of the second period.
Humphreys missed two kicks at goal before Ellis arrived to orchestrate a solid Leicester finale when the Tigers forwards camped deep inside Worcester's 22.
Warriors skipper Pat Sanderson, a tireless presence throughout, tried to rally his team for one last stamina-sapping effort, but Leicester had enough know how and composure to keep Worcester where they had been for most of the match - away from Tigers' line.
Pens: Drahm 2
Pens: Humphreys 2
Yellow cards: Powell (23, Worcester), Murphy, Jennings (both 23, both Leicester)
Worcester Warriors:15 Shane Drahm, 14 Aisea Havili, 13 Dale Rasmussen, 12 Gary Trueman, 11 Marcel Garvey, 10 James Brown, 9 Ryan Powell, 8 Kai Horstmann, 7 Pat Sanderson (c), 6 Drew Hickey, 5 Tim Collier, 4 Craig Gillies, 3 Tevita Taumoepeau, 2 Chris Fortey, 1 Darren Morris.
Replacements: 16 Chris Horsman, 17 Aleki Lutui, 18 Richard Blaze, 19 Tom Harding, 20 Nick Runciman, 21 Dominic Feaunati, 22 Thinus Delport
Leicester Tigers:15 Sam Vesty, 14 Alesana Tuilagi, 13 Ollie Smith, 12 Dan Hipkiss, 11 Seru Rabeni, 10 Ian Humphreys, 9 Frank Murphy, 8 Brett Deacon, 7 Shane Jennings, 6 Tom Croft, 5 Ben Kay, 4 Leo Cullen (c), 3 Julian White, 2 James Buckland, 1 Marcos Ayerza.
Replacements: 16 Gavin Hickie, 17 Martin Castrogiovanni, 18 James Hamilton, 19 Jordan Crane, 20 Harry Ellis, 21 Daryl Gibson, 22 Geordan Murphy.
Referee: David Rose
Touch judges: Stuart Terheege, Ashley Reay
Television match official: Matt Peters, Graham Hughes