Durham's LV= County Championship title hopes were given a huge boost as Graham Onions and Chris Rushworth inspired them to a stunning nine-wicket victory at Derbyshire.
There had been little between the Division One leaders and a Derbyshire side needing victory to help them avoid relegation before the hosts were skittled for just 63 on the final day.
Onions produced a spell of 5-4 in 41 balls and Rushworth claimed 3-31 to leave Durham's batsmen with a victory target of 37, which they reached in 7.5 overs to go 27.5 points clear at the top of the league
A much less uplifting outcome had seemed in prospect earlier in the day when seamer Tony Palladino's season-best 6-90 limited Durham - bowled out for 325 - to a meagre lead of 27 and made a draw appear virtually inevitable.
Instead, with Somerset beating Surrey, Derbyshire's hopes of staying up were all but extinguished in ideal pace bowling conditions.
The ball swung lavishly at times and occasionally kept low but Derbyshire contributed to their own downfall with some poor strokes and leaden footwork.
Usman Arshad polished off the remnants with two wickets in 13 balls after Onions and Rushworth had swept away the flimsy foundations.
Rushworth started the rot in the second over when he had Ben Slater trapped in front for a duck and the seamer also accounted for Paul Borrington (10).
Only skipper Wayne Madsen scored in excess of 10 before he fell for 15, leaning forward to a ball from Onions that moved away late before being pouched in the slips.
Alex Hughes (4) was also bowled by Onions (5-23), who then had West Indies batsman Shivnarine Chanderpaul (10) pinned in front, playing all round a ball that did not get up much.
By this stage, Derbyshire had fallen to 44-5 and the rest of the order was quickly swept away.
Mark Stoneman (7) went early after reaching 1,000 first-class runs for the season for the first time, but there were few other alarms as Durham reached the target with more than 37 overs to spare.