Former England back-rower Pat Sanderson scored a 20-minute hat-trick of tries as Worcester crushed GRAN Parma 50-0 in awful conditions at Sixways.
The eight-try win gives the Warriors an almost unassailable lead in Pool 2, and their 14 points from a possible 15 is on target for a home quarter-final in April.
Big back-rower Kai Horstmann followed his captain's lead by scoring either side of the break, and the crowd were on their feet when star signing Rico Gear did all the work for Mark Tucker to score their side's seventh try.
To GRAN Parma's credit, they sent on five replacements and kept the home side scoreless for a 20-minute spell as the rain began bucketing down at a floodlit Sixways Stadium.
It wasn't until the 73rd minute that the Warriors added to their score, but it was worth the wait for home fans as exciting 19-year-old winger Miles Benjamin showed strength and pace to score a long-range try against the tiring Italians.
Worcester have Pool 2 at their mercy after nearest rivals Montauban were beaten in a thriller in Romania.
Home side Bucuresti took a 16-7 halftime lead thanks to a try and the boot of full-back Florin Vlaicu, and although the French club clawed their way back in front, Vlaicu's 78th-minute penalty goal clinched a 19-17 victory.
Likewise in Pool 1, Bath look to have already secured top spot after Friday night's win over Albi.
Pool rivals Auch fell 25-20 at Overmach Rugby Parma today, despite leading 13-6 at the break. The home side scored three tries through German Fontana, Pietro Travagli and Riccardo Pavan, with outside-half Barry Irving kicking four goals.
In the battle of Pool 4 also-rans, Montpellier struggled to a 19-13 victory over Petrarca in Italy.
Centre Grant Rees scored the French side's only try, with full-back David Bortolussi supplying the rest of their boots with five goals. Flanker Mariano Lorenzetti scored the home side's only try.
