Leicester scored three late goals in a dramatic finish to their win over Birmingham in the Championship.
The visitors went ahead when Matt Green drilled in a 12th minute shot from close range at the King Power Stadium.
The Foxes equalised through Jamie Vardy's strike after 78 minutes before Andy King's clinical finish and a David Nugent penalty put them ahead.
Leicester's 10 points from four games is only the second time in 22 seasons that they have reached double figures so soon - and the first time since the 2008-09 League One promotion campaign.
Chris Burke's shot for Birmingham came too late as Leicester continued their unbeaten start to the season.
Birmingham, in contrast, have lost three of their opening four league matches and suffered their latest defeat after taking the lead against the run of play.
The home side failed to clear a Shane Ferguson cross and Birmingham's summer signing Green, who scored 40 goals in 62 league games for Mansfield, pounced.
Leicester created plenty of chances but could not find the finishing touch and they almost paid the price when Neal Eardley had a free-kick for the visitors tipped round the post by keeper Kasper Schmeichel.
The home side kept pushing and Vardy powered in a low right-foot shot from the edge of the penalty area for the equaliser.
Nugent set up King to score before converting a penalty after Eardley had brought down Lloyd Dyer.
Substitute Burke's last-ditch effort was not enough to prevent Leicester securing a first home win of the season.
Leicester manager Nigel Pearson:
"It was a good three points although we made heavy weather of it.
"We wasted a lot of good chances to score and conceded with their first meaningful attack. So it looked as though it was going to be a potentially frustrating afternoon.
"But we were able to come from a losing position to win the game and I was really pleased with the response from the players in the second half."
Birmingham manager Lee Clark:
"I warned the players at half-time that we had to do something different. We were leading 1-0 but it was like the Alamo at times the way we were having to defend.
"Unfortunately there is nothing financially in the way of changing things. We have just got to work hard and try and improve it. We need more at the top end of the field. But as I've said there are no finances. I've got no money.
"I am feeling frustrated but I still feel that, given time, I will get it right. I don't believe there is anyone who can do it better."
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