Skipper Dan Freeman put in a man of the match performance for Grantham with the day’s top bowling figures of seven for 31 and an unbeaten 61 while James Dobson hit 53 in their side’s six wicket win.
And Market Deeping bowled Nettleham out for 129 and went on to win by five wickets.
Lindum continue their progress up the table, moving into third after beating Boston in a hard fought game.
Tom Poole made 51 for Boston while Matt Rutherford took five for Lindum, who had only two wickets in hand when the winning runs were scored.
But it was Bracebridge Heath who made the biggest jump, going from eighth to fourth after recording the highest total of the day with 236 for eight at Sleaford.
Nick John hit 73 and Kit Spence 64 and despite 82 from Tom Shorthouse, Sleaford were all out for 143, Alex King ending the home side’s innings with a hat-trick.
Grimsby moved above Skegness into eighth place with a win over Bourne after some steady batting from Steve Crossley brought him an unbeaten 80 and took his side to 209 for eight.
David Carr then took five wickets and Matthew Cocks four as Bourne were all out for 156.
Louth claimed their first win of the season at Woodhall Spa, restricting them to 170 for nine of which Prasanna Jayawardene made 50.
Laurence Scott’s 61 and Richard Bell’s 65 helped the visitors to a three wicket win but they failed to move off the bottom of the table, a position they now share with Boston.
Woodhall Spa have yet to claim an outright win this season but still lie sixth equal with Bourne.
Results: Boston 175-9 (Poole 51, Rutherford 5-44), Lindum 176-8; Bracebridge Heath 236-8 (John 73, Spence 64), Sleaford 143 (Shorthouse 82, King 3-25 - hat trick); Woodhall Spa 170-9 (Jayawardene 50), Louth 171-7 (Scott 61, Bell 65); Nettleham 129, Market Deeping 132-5; Grimsby Town 209-8 (Crossley 80no, Farmery 52), Bourne 156 (Carr 5-72); Skegness 193 (Freeman 7-31), Grantham 195-4 (Dobson 53, Freeman 61no).