Staverton Park remain in pole position to make the last four of the Hollingsworth Trophy after closest Group B rivals Brampton Heath suffered a 4-1 defeat at Collingtree Park.
Although Lee Bellham and Mark Halliday took the second game for Brampton with a hole to spare, the hosts grabbed the honours thanks to a 3&2 success from Kevin Parfitt and Jody Parfitt, and two further victories down the 18th hole.
To have any hope of qualifying for the semi-finals, Brampton now need to beat Staverton by the scoreline of 4-1 or better in their remaining home match later this month.
A combination of youth and experience proved decisive for Kettering against Overstone Park as they maintained their perfect start to the campaign in Group C with a 4-1 home success.
Youngsters Reece Dodd and Joseph Hyde (2&1) bagged the opening point, seasoned club members Jim Campbell and Dave Draper (4&2) extended the lead, before Jamie Ashcroft combined with teenager Ed Keech (3&2) to secure the team’s third win in three.
The visitors took game four down the last, but Nick Keech and Chris Brigstock ensured Kettering have a decent points advantage over closest challengers Peterborough Milton, who they take on towards the end of May.
Northants County can still snatch top spot, but they will need to beat Milton at home this weekend and then get a positive result at Overstone on the last day to have any chance.