Wisbech Town first team went top in both the Tucker League on Saturday and Rutland League on Sunday as their title rivals both slipped up.
Wisbech won by five wickets to go top of the Tucker before their crucial clash at second-place Ramsey next weekend.
Ramsey lost their game, so Wisbech now go 12 points clear after they disposed of Nassington by doing the hard work of dismissing them for 121 in 32.2 overs in the heatwave.
“It’s not really an issue if we lost to Ramsey,” said skipper Alan Burton. “If we beat them then it is an issue as we’ll be a decent lead of about 30 points clear and it will be like a game in hand.
“We’ve got a couple more games like that coming up with teams who are in there, like Foxton and March.
“The main thing is making sure we turn up and perform well on that day.”
He added on last weekend’s victory: “We wanted to bat first but we lost the toss. It was a good win in the end.”
Burton maintained his fine form, following the previous week’s century with an undefeated 62 to provide the backbone of the reply. He and Gary Freear (23) opened up with a rapid 60 stand off six overs and cruised to victory at 125-5 in 18.4 overs.
Earlier Kieran Haynes grabbed 2-43, Bradley Perrett 1-22, Craig Johnson 2-22, Gary Freear 1-7, James Williams 2-1 and Ivan Burgess 1-0.
The Seconds, who are third, host top placed Old Leysian.
On Sunday Eaton Socon lost and Wisbech took advantage by beating local rivals March.
Other scores: Wisbech Town 2nd beat Yelling by 5 wickets in CCA Senior League Division 2
Yelling 160-9 (Brodie Ellis 1-23, Matthew Parrin 3-39, Carl Pope 5-26).
Wisbech 161-5 (Danny Emmington 14, Jason Esser 51, Jamie Gollands 41, Dom Stannard 24, Matt Esser not out 10).
Wisbech 3rd beat Longstowe by 30 runs in Mr Cricket CCA Junior League 2 North
Wisbech 204-5 (Adrian Clare 29, Gavin Plume 16, Nick Pack 50, Ben Tarrett 44, Richard Harnwell 18, Dean Dodman not out 17, John Mallett not out 15).
Longstowe 174-8 (Ryan Harnwell 3-41, Tarrett 4-51).
Longstanton Grasshoppers 2nd beat Wisbech 4ths by 78 runs in Mr Cricket CCA Junior League 4 North
Longstanton 166-9 (Nick Drew 3-39, Martin Parrin 4-32, Harrison Smith 1-31).
Wisbech 88 (Tom Buck 19, Jonathan Garner not out 12, Paul Garner 12).
Wisbech beat March by 83 runs in Rutland League Division 1
Wisbech 260-8 in 45 overs (Simon Freear 92, James Williams 24, Alan Burton 38, Bradley Perrett 15, Jamie Gollands 24, Gary Freear 26; Steve Seymour 1-34, Tyler Phillips 1-36, Richard Green 2-54, Joshua Jackman 4-53).
March 177 in 37.2 overs (Tommy Howgego 34, Ben Pyle 14, Tyler Phillips 27, Toby Nulty 38, Joshua Jackman 13, Andrew Wright not out 23; Sam Darlow 2-25, Gary Freear 3-60, Carl Pope 4-35, Alan Burton 1-21).
Wisbech 2nd beat Isham by 1 wicket in Rutland Division 5
Isham 187-8 (Brodie Ellis 2-29, Jason Esser 3-44, Harry Johnson 2-30, John Mallett 1-26).
Wisbech 188-9 in 44.5 overs (Matt Esser 68, Laurence Twell 22, Arun Nair 14, Jason Esser not out 28).