Sidley marched into the semi-finals with a 6-3 win over Arundel at Gullivers which keeps their season alive.
Out of contention in the championship, the RUR Cup remains their only hope of silverware and goals from Shae Spreafico, Dave Ward, Russell Eldridge (two) and Wes Tate (two) did the damage to Arundel who are in the middle of a bad run.
Sidley boss Peter Heritage said: "Russell Eldridge must have had ten chances but over the past few weeks he has been one of the best players in the County League.
"I still think we can put a run together and be a top five side by the end of this season. The good thing about this result is that it also keeps the other players on their toes as there is competition for places."
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