Riyad Mahrez scored two penalties as Leicester City won 3-2 at Everton on Saturday to ensure they will be top of the Premier League at Christmas.
The in-form winger scored a spot-kick in each half, either side of Romelu Lukaku netting in his seventh consecutive league game for the hosts.
Shinji Okazaki appeared to have wrapped up the points, before a late strike from substitute Kevin Mirallas set up a dramatic finish as Claudio Ranieri's men held on.
Leicester's eighth victory from 10 games means they are guaranteed to be top of the league at Christmas and the omens look good for a shock title bid as five of the last six teams to have held that status went on to be crowned champions.
It was Okazaki who had the only attempt of the early stages when he prodded Marc Albrighton's cross narrowly wide.
Okazaki was bundled over by Ramiro Funes Mori after driving into the box and Mahrez took the penalty, converting with a calm low effort to beat Tim Howard's dive.
But Everton levelled five minutes later. Tom Cleverley slipped a pass through to Barkley and the England midfielder had an attempt saved by the legs of Kasper Schmeichel.
Barkley shot again from the rebound and was denied by King's headed clearance on the goal-line, but the ball then broke to Lukaku, who made no mistake with a powerful finish to end a dramatic scramble.
Early in the second half, John Stones had a half-hearted penalty claim turned down after heading onto the arm of Christian Fuchs from close range, while Vardy curled a shot just past the post at the other end.
The victory was sealed four minutes later when Seamus Coleman's clearance was blocked by Albrighton – with Everton claiming the winger had used an arm – and Vardy seized possession to slip a square pass to Okazaki, who finished impressively with his left foot.
