The Campbelltown-Camden Ghosts could not continue the winning form from round 11, going down to the Western Suburbs at Pratten Park at the weekend.
Western Suburbs batted first, setting a solid 307 runs for the Ghosts to chase.
Batsman Alec Baldwin had a superb innings at number four, nabbing 127 runs from 167 balls in just under three and a half hours.
He remained not out when Western Suburbs declared after almost 84 overs.
Ghosts bowler Iain Carlisle was the standout for Campbelltown, bagging three wickets from almost 10 overs, though he was expensive at 63 runs and no maidens.
Jaydyn Simmons, Peter Baker, Luke Webb and Jack Preddey also took one wicket each.
The Ghosts didn’t give away a single no ball or wide in their bowling innings.
Things only went downhill when Campbelltown took to the crease, with openers Mitchell Carruthers and Aaron Yabsley dismissed for just five and nine runs respsectively.
James Shepherd was responsible for taking both openers and also dismissed Webb for eight later in the innings.
Captain Nick Carruthers top scored for the Ghosts with 45 before being taken by Cook (who netted five wickets), but the wickets fell in quick succession after him.
They were dismissed for just 149 after 58.3 overs and were sent in to bat again.
Cook and Shepherd continued the good form with the ball in the second innings, taking two wickets each.
The Ghosts could not reach the required runs and finished their innings at 5/141, with Simmons top-scoring at 56.
The openers were again dismissed for single figures, scoring 10 between them.