Mamady Sidibe headed a late winner for Stoke City as they condemned fellow Barclays Premier League newcomers West Bromwich Albion to a third successive defeat at the Britannia Stadium.
The re-match between the top two in last season's Championship fell some way short of top-flight standards for long periods in a match heavy on industry but short on attacking flair.
Dave Kitson lasted just 10 minutes and was stretchered off with a knee injury, Richard Cresswell his replacement.
Keeper Scott Carson started well, beating away Sidibe's well-struck shot from 25 yards.
The hosts looked more dangerous in attack but lacked cutting edge - Danny Higginbotham failing to beat the first defender with a low cross, despite having time and space on his side following a measured Delap lay-off.
Albion offered little of note in the opening third of the match, lone striker Ishmael Miller looking increasingly isolated up front.
He did, though, serve notice of his threat after half-an-hour, collecting a loose ball just outside the area and hitting a dipping, first-time effort just over the crossbar.
At the other end, Delap flashed wildly off-target with a hopeful strike of his own.
far post
The Irishman had a series of throw-in opportunities, but Tony Mowbray's side handled the danger, which has served Stoke so well this term, competently.
Cresswell appealed half-heartedly for a penalty when he was strong-armed off the ball by a combination of Jonas Olsson and Meite, but was rightly turned down.
Carson acted quickly to sweep the visitors' lines moments into the second half, rushing out of his penalty area and sliding the ball back towards halfway.
And the former Liverpool keeper was again alert after 52 minutes, getting down well to gather Soares' drilled attempt from 18 yards.
West Brom were struggling to get a foothold in proceedings until Miller again tried his luck from an unlikely position.
This time his chipped shot lurched high towards the far post, forcing Thomas Sorensen to concede a corner.
Jonathan Greening headed wide from Chris Brunt's left-sided delivery.
Carson a Delap cross from the left with an hour gone, but Greening was on hand to hoof clear.
going forward
The Albion skipper was soon involved going forward again, squaring calmly to Miller on the six-yard line.
Miller went down with Abdoulaye Faye in attendance but was himself penalised for pushing.
Substitute Michael Tonge was next to test Carson, in what was fast becoming a nervy time for 23-year-old. He spilled the shot but regained possession before Sidibe arrived.
Stoke broke swiftly down the right with 20 minutes left and although Olsson did well to head the cross away from Cresswell, there were strong shouts for a foul on Sidibe, who was sent tumbling six yards from goal.
The match descended into tetchiness in the final stages, with both sides betraying a lack of discipline andthere was a lengthy stoppage after Ryan Shawcross went down injured.
Andy Griffin nearly handed the Baggies a goal when he was caught napping by Filipe Teixeira, but after cutting into the box the Portuguese midfielder shot wastefully high and wide. It proved a costly miss.
With six minutes left Higginbotham found space on the overlap and drifted a cross high to the far post.
West Brom were not short of numbers in the box but Sidibe rose almost unchallenged to head across Carson and into the corner.