Leicester’s defence of their Premier League title began with a shock defeat at newly promoted Hull, who are managerless and relegation favourites.
Under caretaker boss Mike Phelan, Hull took the lead when Adama Diomande and Abel Hernandez combined acrobatically, with Diomande awarded the goal.
Riyad Mahrez replied from the penalty spot at the start of the second half after Demarai Gray had been fouled.
But Robert Snodgrass earned the Tigers victory after a cross was not cleared.
Danny Simpson’s clearance from Ahmed Elmohamady’s ball into the area only found Snodgrass on the edge of the box, and he drilled home.
It is the first time the reigning English champions have started the season with a defeat since 1989, when Arsenal lost at Manchester United.
What was wrong with Leicester?
The Foxes’ title success was built on a solid defence and impressive finishing, but they managed neither at the KCom Stadium.
With Robert Huth suspended, summer signing Luis Hernandez came into the Leicester back four, which looked vulnerable whenever Hull attacked down the flanks.
The defending champions also struggled up front, with Jamie Vardy missing their best chances – and they needed the help of referee Mike Dean for their equaliser.
Tom Huddlestone appeared to stand on Ahmed Musa’s heels outside the Hull area, but Leicester’s £18m record signing fell into the box and Dean pointed to the spot.
Vardy, who scored 24 Premier League goals last season, miscued badly from two Musa pull-backs and had another follow-up effort blocked by Jake Livermore after Christian Fuchs’ shot was saved.
But otherwise Leicester created little against a makeshift Hull defence that featured midfielder Livermore at centre-half alongside Curtis Davies.
Analysis: Foxes off-balance – Waddle
BBC Radio 5 live analyst Chris Waddle felt the balance of Claudio Ranieri’s side was wrong, with Gray, Musa and Vardy often all in the same area of the pitch.
“Mahrez was great on the left but Gray kept cutting in from the left and the two strikers Musa and Vardy were almost holding hands with him.
“N’Golo Kante has been sold so Andy King was playing in front of their defence, but he did not look like he has the energy to play there.
“King likes to get forward – dropping off and getting the ball like Kante did is not his strength.”