Leicester
beat Watford to move five points clear at the top of the table as Riyad
Mahrez scored his 15th Premier League goal of the season.
After second-placed Tottenham drew with third-placed Arsenal, the Foxes took a step closer to English football's most unlikely title win.
Mahrez almost set up Jamie Vardy for an early goal as the Foxes started well.
And a similar start to the second half saw the Algerian rifle high into the net after Jose Holebas cleared to him.
The 25-year-old, who has scored or assisted 26 goals this season, worried Leicester after he seemingly pulled his hamstring late in the game and was substituted but Mahrez later said it was only cramp.
Despite good chances for Watford strikers Troy Deeney and Odion Ighalo, the visitors, who flirted with relegation last season, held on and now have nine games between them and a historic first title triumph.
The victory also takes them 11 points clear of fifth-placed West Ham as the Foxes close on a Champions League spot and they are 41 points better off than they were at the same stage last season.
