Lancashire secured their spot in the Vitality Blast quarter-finals by skittling already-qualified Durham for their lowest ever Twenty20 total as the knockout stages began to take shape.
After eight wins from their previous nine outings in the competition, Durham's streak was broken in style as Lancashire left them 78 all out for a 65-run win.
Alex Davies made 64, by far the best knock of the night at Chester-le-Street, to set up a score of 143 for six.
At its worst the reply sat at four for four, James Faulkner and Toby Lester sharing the early scalps, before an air of respectability arrived.
Gloucestershire are also into the knockouts, securing passage from the South Group with a tense five-run victory over Surrey at Bristol.
The hosts put on 174 for six, built around Kieran Noema-Bennett's career-best 57 not out, and defended it gamely.
Ben Foakes' 59 helped take the Brown Caps within touching distance but, after he was bowled by David Payne, Ryan Higgins delivered a tight final over.
Somerset will also be involved in the last eight following their 28-run win over Glamorgan.
New Zealand all-rounder Corey Anderson was to the fore, smashing 72 in 43 balls at Taunton in a first-innings mark of 210 for eight.
The Welshmen managed 181 for nine in response, undone by Max Waller's four-wicket haul and two from Jerome Taylor.
Kent held their nerve at Beckenham, holding on for a three-wicket win against Middlesex.
The visitors were defending 189 for seven, England's Dawid Malan's 36 the best individual effort while Joe Denly's spin returned figures of three for 25.
They were eclipsed with three balls left, Daniel Bell-Drummond setting the tone with 62 at the top of the order and local boy Alex Blake hitting five sixes in a crucial 57.
The New Road boundaries proved too small to contain Riki Wessels as Nottinghamshire slugged their way to victory over quarter-finalists Worcestershire.
Wessels needed just 18 balls for his 55, striking nine sixes, as the Outlaws reeled in a target of 192 with 11 balls remaining.
Patrick Brown stopped the damage getting even worse, one of three wickets for the seamer, but the defending champions continued finding the ropes to seal the points.
Just 7.5 overs were possible after rain ruined Essex's trip to Hampshire, with the travelling team halted at 72 for four.
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