The Foxes were quick out of the blocks with three goals inside 25 minutes before they let up in the second half with the Black Cats outscoring them 2-1.
Jamie Vardy got things underway for Leicester with a long range glancing header from Marc Albrighton's free-kick before Riyad Mahrez got the first of his double when ghosting in ahead of Patrick van Aanholt to head home another Albrighton cross in the 18th minute.
The Algerian international made it 3-0 seven minutes later after he had been brought down in the area by Lee Cattermole, dusting himself off to beat Costel Pantilimon from the spot.
Dick Advocaat's Sunderland clawed their way back on the hour when Adam Johnson slipped a nice ball through to the clinical Jermain Defoe who fired past Kasper Schmeichel's right hand, but any hopes of a comeback were put to rest six minutes later when a revitalised Albrighton added a goal to his two assists when he was able to fire home after Jeff Schlupp's cross fell to him in the area.
The visitors pulled another one back in the 71st minute through first-half sub Steven Fletcher who nodded home an aerial ball from Jeremain Lens at the back post but the damage had already been done by the home team who momentarily take spot on the league table.
Leicester City: 4 (Jamie Vardy 11', Riyad Mahrez 18'/(pen) 25', Marc Albrighton 66')
Sunderland: 2 (Jermain Defoe 66', Steven Fletcher 71')
King Power Stadium, Leicester - 32,242
- Are Leicester set to improve even further under Ranieri following last season's brilliant finish?
- Could Albrighton resurrect his career with the Foxes?
- Are Sunderland already staring down the barrel? Can they bounce back quickly from a heavy first day defeat?
PICTURED: This lad needs to cool off, he's on fire! #LeiSunpic.twitter.com/hKE4iIXm6P
— Leicester City (@LCFC) August 8, 2015
Good performance and great start to the season! Let's continue to build on this #lcfcpic.twitter.com/3Ucg2qbNGS
— Wes Morgan (@Wes5L1nk) August 8, 2015