The boot of Jonny Sexton allowed reigning champions Leinster to maintain their unbeaten record in Pool 3 as they twice come from behind to win 18-13 at Bath.
The home side scored the only try of the game through England wing Matt Banahan, but six penalties from the Irish flyhalf were enough to guide Leinster to a win that put them three points clear of Glasgow Warriors at the top of the table.
A win over Bath at the Aviva Stadium, Dublin, next weekend, where more than 40,000 tickets have already been sold, will end the English club's hopes of making the last eight and set Leinster on the way to a seventh successive quarterfinal.
Leinster bombed a few early chances and then found themselves playing second fiddle for much of the first-half as Bath produced some of their best rugby of the season.
Elsewhere Clermont Auvergne ended Leicester Tigers' unbeaten record in the Heineken Cup this season with a commanding 30-12 victory in Pool 4.
Clermont recorded their 35th consecutive home victory in front of a partisan 18,000 crowd at the intimidating fortress Stade Marcel Michelin.
The Tigers dominated their hosts scrum in emphatic style and scrummaged Clermont off the park all afternoon but it wasn't enough against a more physical and abrasive French unit around the field.
In Sunday's other fixture Glasgow Warriors moved into second place in Pool 3 of the Heineken Cup with an impressive 20-15 victory over Montpellier at Firhill.
Duncan Weir opened the scoring with a penalty after 12 minutes for the hosts but Montepllier's response was swift with Martin Bustos Moyano kicking three points for his side five minutes later.
Eventually Glasgow wing Federico Aramburu's scored five minutes from time to clinch the victory for the Scottish side.
Bath 13 Leinster 18
Pens: Barkley 2
Yellow card: Francois Louw
Bath: 15 Nick Abendanon, 14 Jack Cuthbert, 13 Dan Hipkiss, 12 Olly Barkley, 11 Matt Banahan, 10 Stephen Donald, 9 Michael Claassens, 8 Simon Taylor (captain), 7 Guy Mercer, 6 Francois Louw, 5 Ryan Caldwell, 4 Dave Attwood, 3 David Wilson, 2 Chris Biller, 1 David Flatman.
Replacements: 16 Charlie Beech, 17 Nathan Catt, 18 Anthony Perenise, 19 Will Spencer, 20 Andy Beattie, 21 Chris Cook, 22 Tom Heathcote, 23 Sam Vesty.
Leinster: 15 Rob Kearney, 14 Isa Nacewa, 13 Fergus McFadden, 12 Gordon D'Arcy, 11 Luke Fitzgerald, 10 Johnny Sexton, 9 Isaac Boss, 8 Jamie Heaslip, 7 Sean O'Brien, 6 Kevin McLaughlin, 5 Damian Browne, 4 Leo Cullen, 3 Mike Ross, 2 Richardt Strauss, 1 Heinke Van Der Merwe.
Replacements: 16 Sean Cronin, 17 Cian Healy, 18 Nathan White, 19 Devin Toner, 20 Shane Jennings, 21 Eoin Reddan, 22 Ian Madigan, 23 Eoin O'Malley.
Pens: Sexton 6
Clermont 30 Leicester Tigers 12
Tries: Malzieu, Fofana 2
Cons: Parra 3
Pens: Parra 3
Clermont: 15 Lee Byrne, 14 Sitiveni Sivivatu, 13 Aurélien Rougerie, 12 Wesley Fofana, 11 Julien Malzieu, 10 Brock James, 9 Morgan Parra, 8 Julien Bonnaire, 7 Alexandre Lapandry, 6 Gerhard Vosloo, 5 Nathan Hines, 4 Julien Pierre, 3 Davit Zirakashvili, 2 Benjamin Kayser, 1 Lionel Faure.
Replacements: 16 Ti'i Paulo, 17 Vincent Debaty, 18 Clément Ric, 19 Jamie Cudmore, 20 Elvis Vermeulen, 21 Kevin Senio, 22 David Skrela, 23 Regan King.
Leicester Tigers: 15 Geordan Murphy, 14 Horacio Agulla, 13 Matt Smith, 12 Manu Tuilagi, 11 Alesana Tuilagi, 10 Toby Flood, 9 Ben Youngs, 8 Thomas Waldrom, 7 Jules Salvi, 6 Tom Croft, 5 George Skivington, 4 Louis Deacon, 3 Martin Castrogiovanni, 2 George Chuter, 1 Marcos Ayerza.
Replacements: 16 Rob Hawkins, 17 Boris Stankovich, 18 Dan Cole, 19 Ed Slater, 20 Steve Mafi, 21 Sam Harrison, 22 Billy Twelvetrees, 23 Scott Hamilton.
Glasgow Warriors 20 Montpellier 15
Pens: Weir 5
Tries: Escande, Matadigo
Cons: Bustos Moyano 2
Glasgow: 15 Stuart Hogg, 14 Federico Aramburu, 13 Pete Murchie, 12 Graeme Morrison, 11 Rory Lamont, 10 Duncan Weir, 9 Chris Cusiter, 8 Ryan Wilson, 7 John Barclay, 6 Rob Harley, 5 Alastair Kellock, 4 Richie Gray, 3 Michael Cusack, 2 Pat MacArthur, 1 John Welsh.
Replacements: 16 Dougie Hall, 17 Ryan Grant, 18 Ed Kalman, 19 Tom Ryder, 20 Chris Fusaro, 21 Henry Pyrgos, 22 Troy Nathan, 23 Ruaridh Jackson.
Montpellier: 15 J-B Peyras Loustalet, 14 Pierre Bérard, 13 Paul Bosch, 12 Thomas Combezou, 11 Martin Bustos Moyano, 10 Santiago Fernandez, 9 Eric Escande, 8 Alex Tulou, 7 Rémy Martin, 6 Vassili Bost, 5 Drickus Hancke, 4 Joe Tuineau, 3 George Jgenti, 2 Mickael Ladhuie, 1 Goderzi Shvelidze.
Replacements: 16 Joan Caudullo, 17 Mikheil Nariashvili, 18 Kevin Kervarec, 19 Masi Matadigo, 20 kelian galletier, 21 Benoit Paillaugue, 22 Lucas Amorosino, 23 Ilian Perraux.
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