Whiteleas and Harton maintained their promotion push following a comprehensive victory at challengers Evenwood.
Having won the toss, the home side elected to bat first and must have been rueing their decision when Abdul Ameer dismissed captain Luke Bannister without scoring in just the third over.
Evenwood were able to steady the ship for six overs until Chris Nichol removed overseas danger-man Khan, following a tidy slip catch from Rob Scorer.
At 27-2, Leas then turned the screw on their hosts with the pace of Ameer and Nichol proving too much.
In a devastating opening partnership, Ameer went on to capture another five-wicket haul (his sixth of the season) for just 25 runs, but it was Nichol at the other end who deserved the plaudits.
Bowling into a strong headwind, the left armer returned exceptional figures of 5-18 as Evenwood were all out for just 58.
Despite losing opener Alex Thomas cheaply, Leas were never in doubt reaching their target as Ray McRae (24no) carried on his good form, supported by captain Owen Peterson (21no).
The result gave Leas a maximum 30 point return as they maintained second position in the league.
The second string made it seven wins on the spin to stay in pole position.
Asked to bowl first, Leas put the visitors to the sword as they were all out for 132, thanks to Sid Corner Jnr (3-3), Ryan Hale (2-29) and Navneet Singh (2-29).
Despite losing a few early wickets, the home side saw the job through with man-of-the-match Corner Jnr scoring 38, picking up 28 points in the process.