Channel Island champions Old Victorians began the defence of their title with a four-wicket victory over Wanderers.
After restricting Wanderers to 196-9 as Andy Brown and Nathan Watkins each took three wickets, Ward Jenner hit 57 not out and Watkins scored 55.
The win puts OVs second in Group A, which is still led by Cobo who have three wins from their three matches.
They edged past Farmers by three runs in an extremely close encounter at the Farmer's Field in Jersey.
Coco were bowled out for 172 in 47 overs as young Jersey bowler Joe Mayes took 5-25 while Cobo and Guernsey captain Stuart le Prevost hit 49 not out.
In reply Farmers fell just short, scoring 169-9 in their allotted 50 overs as Andrew Heard took 3-37 and Tom Ravenscroft took two wickets for 24.
Jersey champions Springfield are bottom of Group B after being thrashed by 10 wickets by Argyll Investments at the KGV in Guernsey.
David Hooper was the star for Argyll as he took seven wickets for 34 as Jon Prince got 47 of Springfield's 66 runs.
In reply GH Smit hit 38 not out and CJ Peatfield was 26 not out as Argyll took only eight overs to knock over their target.
Odey ORs remain top of Group B with a perfect record of three wins from three after beating Jersey side St Ouen by 126 runs at Port Soif.
Mark Jeffries got 48 and Adam Martel hit 41 as Odeys were 218 all out in 49.4 overs.
Despite Jersey international Anthony Kay getting 33, he got little support for his team mates as Aaron Scoones took 4-22 to help his side bowl out St Ouen for 92 in 35.2 overs.