Esteban Cambiasso's bizarre own goal gave West Bromwich Albion a 1-0 win as Leicester City extended their winless Barclays Premier League run to five matches.
The hosts struggled to make the most of their chances against Alan Irvine's men on Saturday, with Jamie Vardy in particular spurning two presentable opportunities.
But ultimately the Foxes were undone by an error two minutes into the second period when Cambiasso inadvertently directed Wes Morgan's clearance into his own net.
Andy King might have earned Leicester a draw in the final 15 minutes but he headed straight at goalkeeper Ben Foster as West Brom held on for their first win since the end of September.
Leicester struggled to provide service for their forwards and with top scorer Leonardo Ulloa starting on the bench due to injury, their only real sight of goal in the opening stages came when Danny Drinkwater blazed a shot over from 20 yards.
West Brom, unchanged from their last Barclays Premier League outing against Crystal Palace, had to bide their time but after growing into the match they almost grabbed a 17th-minute lead, as the in-form Saido Berahino forced Kasper Schmeichel into a smart save with a shot from the edge of the area.
Leicester continued to press and they could have taken the lead in the 37th minute, but Vardy's spectacular overhead kick was straight at Foster.
Albion almost capitalised on that let-off when Chris Brunt slammed a shot over the crossbar following Berahino's clever cut-back but they were ahead two minutes after the break, courtesy of a helping hand from Cambiasso.
Berahino squeezed a low cross into the area and, although Morgan had seemingly cleared the danger with a stooping header, the ball struck his Argentinian team-mate on the leg and crept inside the post.
The hosts did mount a spell of late pressure as they sought an equaliser, with King heading straight at Foster with just under quarter-of-an-hour to go, but West Brom were largely untroubled.
Leicester City manager Nigel Pearson: "It took an own goal to separate the sides today and that is an indicator of how small the margins are. I have to look back at the game and rue the fact we didn't make enough of some situations. That is how it is going for us at the moment.
"We can't get too wrapped up in the negativity that some people throw in our direction. When you have setbacks in life you have to take a look at what is actually going on.
"We feel we have a lot of quality within the squad and that is in all positions. Today we were slightly unlucky. We have some really good highs and we have had some lows. Days like today are frustrating experiences.
"I know what we are capable off and I'm still very confident, given a little bit more time, we will make sure we maximize our quality."
West Bromich Albion manager Alan Irvine: "It means a lot. It is a difficult place to come to and we are the first team to win here. We had to cope with the pressure they put you under and we had to pass the ball. I'm really pleased with the performance.
"It was a complete team performance. We needed a threat up front and we did that. At the back we were solid against some really difficult forwards to play against.
"Three points. Clean sheet. It's a great feeling for us and it gives us a platform to go into the next game - Newcastle at home - which will be really difficult for us.
"I said all along it was going to take a bit of time, but it was important to find the best way of playing for our group of players and we are getting closer to that."
|20 Dec 2014||v West Ham (A)|
|13 Dec 2014||v Man City (H)|
|07 Dec 2014||v Aston Villa (A)|
|08 Nov 2014||v Southampton (A)|
|29 Nov 2014||v QPR (A)|
|22 Nov 2014||v Sunderland (H)|