Withdean 2000 continued their excellent run with a 4-0 victory away to Chessington United.
Goals came from Damion Dobbyn (two), Clay Lamont and Rod Davies.
Manager Peter Edwards said: "It was a professional job and we must keep on doing that."
The Sussex side remain in third eight points behind second placed Wimbledon AFC who trail leaders Wallingford by 13 points.
Withdean still have eight games in hand over the leaders and would go three points clear at the top if they win them all.
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