
Chasetown took the lead after just 4 minutes when George Cater, on his return to the club, raced onto a through ball and lobbed beyond Dino Visser.
The hosts had actually started well so it was no surprise when Daniel Trickett-Smith fired from long range past Matt Sargeant on 22 minutes.
Five minutes later, Thomas Carr drilled home a low shot from a tight angle and then Robert Stevenson added a third goal in 7 minutes, converting a right footed spot kick.
Cater had two chances either side of half time to reduce the deficit but failed to connect sweetly with both and Visser gathered easily.
Trickett-Smith added his second just shy of the hour with a header from a corner.
Leek had further chances to extend their lead but Sargeant made three good saves and the hosts squandered two good chances.