Three stunning slip catches and a stubborn 63 by Pulborough's import Clint Astridge ended Ansty's challenge in division two.
The home side romped home by five wickets.
Ansty were dismissed for 141 with young James Robinson (38) top scoring, Richard Nicholls (30) offered good support.
Jody Healy helped himself to 4-41 off 11 overs and Andy Simmonds wrapped up the tail with a burst of 3-12. Barry Crouch and Shaun Janman took two wickets apiece in Pulborough's reply but Astridge survived a dropped catch to win the game.
Leaders Broadwater slumped to a second consecutive defeat at neighbours Goring.
The home side crashed from 137-0 to 188-9 as opener Rob Hemmingway made 67.
Richard Iago then hit 57 but Broadwater slid from 98-1 to 134 all out against the bowling of Graham Burgess (4-34) and Graham Cornish (4-51).
Broadwater remain top of the table but lead by only by 18 points from Crawley.
Henfield were held at home by Keymer and Hassocks. Henfield batted first and were 210-all out. Paul Vedamuttu top scored with 109, Andy Tatford took 5-82.
Keymer were 199-6 in reply, John Price made 86 and John Carr 54.
Crawley remain second, 18 points behind the leaders following their crushing win at Petworth Park. Crawley batted first and amassed 222 thanks to Musawer (111), Dave Gillett (45) and A Riaz (40).
Park were all out for 73 in reply.
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