Carlisle pulled off a League Cup shock, defeating Championship side Blackburn 4-3 in a dramatic penalty shoot-out after the game had ended 3-3 following extra time.
For 120 minutes both sides served up a cup classic with six goals, a missed penalty and a sending off. Teenager David Symington lashed home the decider in the shoot out after Chris Taylor and Josh Morris had both missed for Rovers.
David Amoo's early goal for Carlisle was cancelled out by a Tom Cairney strike. Chris Taylor gave Rovers the lead only for Lewis Guy to level. Substitute Alan Judge blasted Rovers back in front in extra time only for Amoo to make it 3-3.
There was nothing complicated about Amoo's first goal in the 14th minute. Josh Gillies fired a left-wing corner deep across the penalty area and the Carlisle wingman took advantage of some poor defending to direct a downward header past Simon Eastwood from six yards out.
There was a big slice of fortune about Rovers' 52nd-minute equaliser. Liam Noble stuck out a foot to block Cairney's 20-yard drive, but only succeeded in getting a huge deflection to send the ball away from his own goalkeeper Mark Gillespie's grasp and in by the right-hand post.
Two minutes later Blackburn's Josh King won a penalty after Danny Livesey had challenged clumsily inside the area, only for David Dunn to see Gillespie produce a fine diving save.
However, Taylor then grabbed his first goal for the club in the 56th minute, soaring highest at the far post to nod home Cairney's corner.
Yet Carlisle immediately hit back, Guy forcing his close-range header home in the 62nd minute after Mark Beck had done the spadework on the right.
Judge, who came on as a substitute for extra time, quickly made his mark, rifling home right footed from 12 yards after 95 minutes.
Rovers finished with 10 men after Cairney was cautioned for a foul on Beck then swiftly red carded for dissent. There was more drama in the second period of extra time as Amoo cut in from the left to hammer a shot into the bottom right-hand corner and draw Carlisle level.
And they would go through after keeping their cool in the shoot-out.
Teenage striker Dominic Poleon fired Leeds into the next round as they won 2-1 against Chesterfield.
Leeds have never lost a first-round tie in the League Cup, while the Spireites have now fallen at the first hurdle in the last seven seasons. Yet it was the League Two side who seized a shock 19th-minute lead.
Tendayi Darikwa created space on the right for skipper Drew Talbot, whose measured cross to the far post was headed firmly home by striker Eoin Doyle past Leeds keeper Paddy Kenny who was making his 600th career appearance.
Leeds restored their pride with two goals in four minutes, though. First Michael Brown's 28th-minute strike from 20 yards brought his first goal since November. Then Ryan Edwards lost out to Poleon who advanced to the 18-yard box before shooting into the bottom-left corner.
Darikwa should have restored parity but delayed his shot just long enough for Jason Pearce to clear off the line.
Everton, Southampton and Tottenham were beaten by Leeds in cup competitions at Elland Road last season but Chesterfield were far from over-awed, with Gary Roberts impressing.
An angry Roberts felt he should have had a 50th-minute penalty when brought down by Zac Thompson but referee Carl Boyeson ruled the offence to be outside the box.
Visiting keeper Tommy Lee pulled off a full-length save to prevent Luke Murphy's second goal in as many games for Leeds while Nathan Smith struck an upright for Chesterfield in added time.
There proved to be no upset at Meadow Lane as Notts County scrapped past Fleetwood 3-2 despite finishing the game with 10 men.
The underdogs took the lead on 16 minutes when a mistake by Manny Smith let in Fleetwood's Gareth Evans who planted a delicious chip over a stranded Bartosz Bialkowski.
Notts County hit back in the 28th minute when an inch-perfect cross by debutant Celtic loanee Callum McGregor was met with a superb bullet header by Enoch Showumni into the top corner.
The Sky Bet League One side then took the lead on 39 minutes when, after Joss Labadie's header hit the woodwork, Danny Haynes pounced for his first goal for the Magpies.
County extended their lead on 73 minutes when the impressive McGregor marked his debut with a goal after his deflected shot from 22 yards flew into the net.
After Smith received a second yellow card for a foul on David Ball on 84 minutes, County were left to sweat when Ball scored in the 88th minute but they just held on for the win.
League Cup results:
AET Carlisle * 3 - 3 Blackburn * Carlisle win 4-3 on penalties
FT Leeds 2 - 1 Chesterfield
FT Notts Co. 3 - 2 Fleetwood