Spalding RFC suffered a 38-19 home defeat to Midlands One East leaders Old Northamptonians on Saturday.
Town drop back into the bottom two as a result, with Peterborough picking up a bonus point in their defeat against Matlock.
Fellow relegation rivals Kettering also picked up a shock win over Peterborough Lions, meaning Spalding are now five points from safety.
More rugby in Tuesday’s Lincolnshire Free Press.
Midlands One East: Ilkeston 24 Newark 12; Kettering 19 Peterborough Lions 14; Loughborough 20 Market Rasen & Louth 25; Market Bosworth 10 Bedford Athletic 36; Peterborough 28 Matlock 35; Spalding 19 Old Northamptonians 38; Towcestrians 23 Paviors 17.
Midlands Three East (South): Northampton Mens Own 10 Stamford 88; Rushden & Higham 69 Northampton Casuals 7; Stockwood Park 10 Stewarts & Lloyds 14.
Midlands Four East (South): Aylestone Athletic 10 Bedford Swifts 55; Oundle 46 Westwood 5; St Ives 46 Corby 0; Wellingborough OG 0 Brackley 74.