Brothers Colin and Jonathan Cheer starred as Boston beat Bracebridge Heath by eight wickets in their top-two Lincolnshire Premier League clash.
Colin took 5-78 as Bracebridge were all out for 182, before Jonathan made 128no as Boston reached 183-2 to end the leaders' unbeaten record.
Ollie Burford hit an unbeaten 113 and Matt Mountain 67 in Sleaford's six-wicket victory over Market Deeping.
Deeping's Josh Bowers fell three runs short of a century in their 260-7.
In reply Sleaford reached 263-4 to climb to joint fourth in the table.
Hartsholme's Warren Nel was another of the weekend's century-makers with 127 as his side crushed Woodhall Spa by 177 runs.
Henry Rush also made 53 in Hartsholme's 244-7 before the hosts were reduced to 12-6, eventually being dismissed for just 67.
Bourne in third beat Louth by 38 runs, with Charlie Hopkins top-scoring on 59 in Bourne's 202-8.
Fahad Masood then took 5-60 to dismiss Louth for 164, with Nuwan Shiroman making 56 for the visitors.
No fewer than five batsmen made half-centuries in Grimsby's seven-wicket victory over Lindum, Richard Bishop and Geoff Middleton both scoring 52 in Lindum's 224-7, with Richard Antcliffe (51), Neal Snell (50) and Harry Warwick (58no) reaching the mark in the hosts' 225-7.
Nettleham remain rooted to the foot of the table after a 10-wicket defeat by Skegness with Tony Santini taking 5-12 to dismiss the visitors for 101, and Peter Houghton hitting an unbeaten 67 to see Skegness to 105-0.
Lincolnshire Premier League
Results for Saturday, 30 July
The Mayflower Ground: Bracebridge Heath 182 (C Cheer 5-78); Boston 183-2 (J Cheer 128no)
Abbey Lawn: Bourne 202-8 (Hopkins 59); Louth 164 (Shiroman 56, Masood 5-60)
London Road: Market Deeping 260-7 (Bowers 97); Sleaford 263-4 (Burford 113no, Mountain 67)
Richmond Drive: Nettleham 101 (Santini 5-12); Skegness 105-0 (Houghton 67no)
Augusta Street: Lindum 224-5 (Bishop 52, Middleton 52); Grimsby 225-3 (Antcliffe 51, Snell 50, Warwick 58no)
Jubilee Park: Hartsholme 244-7 (Nel 127, Rush 53); Woodhall Spa 67