Andy Fitzgerald's maiden century for Fletching helped the leaders to a two wicket victory away to reigning champions Crowhurst Park.
Fitzgerald, who joined Fletching this season after many years at St Peters, struck 126 as Fletching clinched victory with one over to spare to move 27 points clear at the top of division one.
Having elected to bat, the home side posted a total of 213-9 with Victor Walcott (36) and Paul Brookes (33) offering solid contributions. Slow bowler Andy Horscroft took 4-63.
The reply centred around Fitzgerald's superb knock, with extras (29) being the next highest score.
Fletching skipper Grant Horscroft said: "It was a fantastic game and a great advert for the league. Credit to Crowhurst because they played in a positive manner."
Despite losing, Park moved up to second as Ringmer were beaten at DPB (Eastbourne) - their first defeat since the opening day of the season.
Former DPB man Colin Coddington hit 43 from 26 balls as Ringmer recovered from 110-7 to make 149 all out. For the hosts, Martin Hanmer took 3-27 and Dan Bradley 3-68.
In reply, Terry Penfold (55) and skipper Steve Hanmer (39) led DPB to victory with four wickets to spare, with Graham Pitts (3-28) being the pick of the bowlers.
Glynde claimed an exciting four wicket success at Chiddingly. The hosts recovered from 72-6 to make 243-8 thanks mainly to a seventh wicket partnership of 137 between Darren Howard (93) and Tom Carr (81). Wickets fell to Paul Rolfe (4-39) and Dale Tranter (3-33).
In reply, contributions from Daryl Williams (66), Gary Baker (47), Dominic Shepheard (41) and Tranter (27 not out) led Glynde to victory.
Skipper Patrick Nolan hit 96 as Ditchling made 196 all out at home to Newick. Skipper David Hutchinson took 3-26 for Newick but his side were dismissed for 143 in reply as Malcolm Frodsham claimed 4-40. Chris Murphy hit 39 and Tiger Jadeja 37.
The clash of the bottom two ended in a draw. Ian Cox hit 67 for Heathfield Park against Wadhurst but his side were dismissed for 156 as Jim Harwood bowled unchanged for 7-42. In an exciting finish, Wadhurst closed their reply on 149-9, Simon Briggs taking 4-31.
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