Leicestershire Foxes were unable to make it back-to-back victories in the Natwest T20 Blast as they suffered a 14-run defeat at Yorkshire Vikings.
Greg Smith made 56 for the Foxes at Headingley but he was unable to see his side home as a middle-order collapse saw Foxes fall short of their target of 169.
Foxes had looked comfortable in their run chase until a flurry of wickets left them requiring 27 from the last two overs.
Unlike at Chester-le-Street against Durham, Foxes could not rely on the firepower of Tom Wells to smash them over the line, after Ben Raine had taken 3-25 to restrict Vikings to 168-5.
Foxes will now probably need to win at least five of their last six games to stand any chance of qualification for the knock-out stages.
Foxes faced a daunting prospect, after winning the toss and electing to field, with the world's No.1 ranked T20 batsman, Aaron Finch, at the top of the Vikings order.
But it was his partner and captain Andrew Gale who made the immediate impact, hitting Charlie Shreck for consecutive boundaries in the first over. Finch, meanwhile, scored just a single run of the Vikings' first 32.
Gale was handed a lifeline on 25 when his thick edge off Shreck failed to stick in the palm of the diving Ned Eckersley behind the stumps.
It was not long until Foxes finally had their breakthrough, though, as seamer Ben Raine took two wickets in two balls to reduce Vikings to 41-2.
First to go was Finch, bowled for a very scratchy five from 13 balls, giving himself some room to hit through the off side. He was followed by Alex Lees, trapped lbw.
Spinners Jigar Naik and Cobb bowled tightly, conceding few boundaries, and at the halfway stage Vikings were 70-2.
The first six of the innings came in the 13th over as Jonny Bairstow smashed Naik over long on but the off-spinner had his man two balls later, having him caught by Greg Smith in the deep.
Gale, on 49, was given a second life the very next ball, chipping a leading edge to Cobb at short midwicket, but the Foxes captain shelled the chance diving forward.
The mistake would not prove too costly as Cobb had him stumped for 55 before Raine bagged his third wicket, having Adam Lyth caught in the deep.
Eckersley's evening would get worse, though. The keeper conceded 12 byes in the innings before letting a top edge from Richard Pyrah drop straight between his gloves.
A flurry of late boundaries – three fours in the penultimate over and two sixes in the last – saw Vikings close on 168-5.
Cobb and Smith set an emphatic tone to the Foxes' reply, both finding the boundary with frequent regularity, the former launching Tim Bresnan over his head for six, as they brought up the 50 partnership up in just the sixth over.
It took a moment of absolute brilliance to dismiss the Foxes skipper.
Cobb launched leg-spinner Adil Rashid down the ground, only for Adam Lyth to jump into the air behind the boundary, flick the ball back to Finch inside the rope, who took the return catch one-handed diving forward.
Eckersley was soon to depart, too, stumped by Bairstow off Rashid just two balls after being saved by the third umpire on a close run-out call.
At the halfway stage, Foxes were cantering at 85-2. Smith and Matt Boyce kept the run-rate ticking over but their partnership ended in catastrophe as a mix-up left Boyce stranded.
Scott Styris's return to the side was brought to a premature end as he was given out caught behind off Azeem Rafiq despite the ball looking to come off his forearm.
Smith brought up his 50 off 46 balls, edging Bresnan through third man for four, before needlessly giving his wicket away moments later, caught trying to shovel the ball over fine leg off Bresnan.
That triggered the collapse as Foxes tumbled from 125-4 to 128-7.
Durham hero Wells, who had hit 24 off the penultimate over in his side's victory over the Jets, could not repeat his performance and smashed the first ball of the penultimate over straight down long-on's throat, all but ending Foxes' hopes.