ASM Clermont Auvergne are now in the driving seat in Pool 5 after they completed impressive back-to-back wins over reigning Heineken Cup champions Leinster.
The French club now have their quarter-final destiny in their own hands and lead the Pool by eight points after they beat the three-time winners 28-21 in front of a 48,964 crowd at the Aviva Stadium - the second highest attendance for a Pool match in the 18-year history of the tournament.
The manner of Clermont's victory, with scrum-half Morgan Parra pulling the strings and finishing with a personal tally of 23 points with the boot, will have made the rest of Europe sit up and take notice.
But the Top 14 outfit may rue Leinster's try by Fergus Mcfadden in the dying moments which secured a vital bonus point and keeps the champions' slim hopes of a quarter-final place alive.
Clermont face the Exeter Chiefs at home and travel to face the Scarlets in the final two games, knowing a victory will secure qualification but the French side will have set their sights on a home quarter-final.
Leinster host the Scarlets and then travel to face Exeter at Sandy Park in the final game and need bonus point wins to reach their fifth Heineken Cup quarter-final in a row.
Exeter are only a point behind the Dubliners and did their own 'double' over the Scarlets with a 30-20 victory at Sandy Park. The Welsh region have lost all four games in the Pool and are out of the qualification race.