Sheffield United 3:2 Walsall
Kevan Hurst and Will Grigg's early second-half goals meant nothing after the Blades staged a sensational comeback to beat the Saddlers by three goals to two.
Goals from Matt Lowton, Lee Williamson and Richard Cresswell (pen) ensured United maintained their 100% start to the campaign.
Danny Wilson stuck with the same team which beat Brentford at the weekend.
It has to be said that United were dominated in most parts of the first-half by the visitors, with Dean Smith's men striking the crossbar after Steve Simonsen spectacularly tipped John Macken's stinging effort onto the upright.
Danny Wilson's contingent could have had a penalty when Nick Montgomery was felled in the Walsall area, but it was Walsall who were presented with the best remaining chances of the first period, but not being able to capitalise.
The Saddlers did however break the deadlock just seconds after the restart. Former Blade Kevan Hurst slotted Walsall into the lead, with Steve Simonsen probably thinking that he could have done better.
Simonsen then parried over Macken's drill, but from the resulting corner Will Grigg doubled the visitor's lead. Simonsen fumbled at the corner-kick, and the ball was lofted back into the area with Grigg able to pounce.
Simosnen then spilled Hurst's shot, and with Walsall destined to increase their lead to three, he stuck out a leg to atone with the follow up.
United got a foothold back into the game when substitute Williamson had an instant impact by being the main contributor behind Matt Lowton's goal, who turned the ball home to halve the Saddlers' lead.
Cresswell's header towards goal looked a certain equaliser, but Westlake headed off the line.
United would, though, level the scoring when Lee Williamson strode forward and curled a beautiful shot into Jimmy Walker's far-corner - the goalkeeper having no chance.
The Bramall Lane faithful were roaring their team onto victory, and the sensational comeback was complete 16 minutes before time. The influential Williamson was brought down in the box by Sadler, leaving Cresswell with the duty to earn the Blades an additional two points. He duly converted into the roof of the net, sending Bramall Lane wild.
Quinn's 25-yarder was just inches over, but United fans had their hearts in their mouths when Simonsen failed to pick up a relatively easy ball, leaving Grigg a goal on a plate, but his effort was, luckily for the Blades, inadvertedly deflected onto the post by Lowton.
United would hang on for an incredible victory against a Walsall side who took the game to their hosts, but United's quality shone in the end with a comeback of all comebacks.
The final score from Bramall Lane: Sheffield United 3:2 Walsall.