Leicester City slipped to their first defeat in five games as they went down to Neil Warnock's Leeds United at Elland Road.
Leeds were given an early lead when rookie full-back Jeff Schlupp was penalised for a trip on Sam Byram after just 90 seconds and Luciano Becchio stepped up to convert the penalty, which proved to be the only goal of the game.
Going into the game, City boasted the highest proportion of goal attempts on target in the second tier (58 per cent), while Leeds had mounted fewer goal attempts than any other Championship club.
Leeds and Ipswich were the only clubs not to have won a Championship match by more than a single goal margin, while City and Brighton alone had not lost a Championship match by more than a single goal.
Leeds boss Neil Warnock has tipped City to win the Championship, but they looked far from title contenders in the first half.
City, looking for their fourth consecutive victory at Elland Road, were strangely out of sorts.
After Becchio drilled home the spot-kick, City struggled to get going after that until the half-hour mark, when they created several opportunities.
Martyn Waghorn was unlucky with a fantastic volley from an acute angle which struck the bar – the third time in consecutive games the City striker has been denied by the woodwork.
His strike partner Jamie Vardy wasted another good opportunity when he failed to hit the target with a volley from 10 yards.
Overall, Leeds were good for their half-time lead, although they only created one other opportunity despite enjoying the lion's share of possession.
City were off colour but had still hit the target five times.
City dominated possession in the second period, but Leeds had something to hang on to. They sat deep to deny City space and the visitors struggled to break down their defence.
Nigel Pearson made three attacking changes, bringing on Marko Futacs, Anthony Knockaert and Jesse Lingard, but City couldn't find the breakthrough.
It was only the second time this season City had failed to score and they will be looking to bounce back on Saturday against Derby County at the King Power Stadium.
