Worcester made history by beating Leicester at Welford Road for the first time in 122 years of trying.
The Warriors, conquerors of Northampton last week, resisted a late fightback from the Tigers to collect maximum points, with five tries setting up their first win at Leicester.
Since the old Worcester Rugby Club first travelled to Leicester in the Midland Counties Cup in 1895, they had made 14 previous visits - and lost them all.
Tries for Alafoti Faosiliva and Josh Adams gave the Warriors a dream start.
A Mike Fitzgerald try and five points from Joe Ford's boot then brought the Tigers close before Adams and Harrison exchanged tries just before the break.
Jack Singleton stretched the lead after the restart and Ryan Mills' try looked to have sealed it, only for Gareth Owen's try to set up a tense finale - but Worcester held out for the historic triumph.
FT: @LeicesterTigers 27 - 31 @WorcsWarriors
Phenomenal stuff. Worcester end 🐯 Tigers' winning streak and do so in an absolute nail-biting finish for their first EVER win at Welford Road 👏
#LEIvWOR#AvivaPrem 🏳️🌈