An unbeaten eighth-wicket partnership of 38 between Andy Poynton and Marlon Barclay was needed to carry Northop over the victory line at The Oval.
The Premier leaders were made to struggle to reach a modest target of 109 after bowling the hosts out cheaply.
Llandudno won the toss and elected to bat, posting a painstaking 108 all out off 49.2 overs, Lucas Hughes top-scoring with 29, while for the Flintshire travellers, Mark Poynton and Barclay both scooped 3-16.
In reply, Northop plummeted to 71-7, Henry Dowd 34, before Andy Poynton (18 not out) and Barclay (17 no) guided the table-toppers to 109-7 off 32.1.
Llandudno skipper Jack Rimmington bagged 4-28 off 10 and Jamie Grimshaw 3-33.
South African ace Jason Underwood hit his club best score of 134 as Brymbo bulldozed their way to a maximum points victory over Denbigh.
Calling the coin correctly and deciding on first knock, the Steelmen amassed 339-7 off 50 overs, Underwood’s innings coming off 101 balls and including nine fours and seven sixes.
Fellow Springbok Christopher Taylor made 66, the pair putting on 136 for the fourth wicket.
William Norman and Connor Davies both posted 39 for the hosts, while for Denbigh, who were without skipper Harrison Jones, Sam Lewis took 3-73 and Gerallt Lyall 2-52.
In reply, the visitors were bowled out for 143, Archie Sussex 46 not out, Lyall 34 and Lewis 32, the latter two forming a 53 stand for the first wicket.
Mohamed Nilam Jayman grabbed 3-35 for the hosts, Norman 2-5, Davies 2-10 and Jack Whitley 2-25.
Dion Holden and skipper Gethin Roberts both struck 69 apiece in Menai Bridge’s match-winning score of 278 at Clappers Lane.
The Anglesey visitors made the most of being put in, Will Blair adding 50, while Gareth Bell snaffled a remarkable 6-22 for the hosts, a spell of remarkable economy considering the ruthless treatment his fellow bowlers came in for off the Bridge batsmen.
Opener Wes Evans scored a total dominant 82 in Gresford’s response of 134-9, Iwan Moore collecting 3-15 and Gerallt Roberts 3-26 for the islanders, who took all 15 points.
Chasing a seemingly very achievable 149 for victory, Bangor’s batting fell apart so Halkyn ended up triumphant at Pant Newydd.
The home side posted 148-8 declared off 48 overs, Nathan Roett leading the charge with 63 not out, while Jamie Griffiths added 35.
For the Citizens, Franco Kasner claimed a superb 5-27 and Owen Reilly 2-41.
In response, Bangor nosedived to an alarming 14-5, the dismissal of Kasner to a run out proving controversial.
Nathan Berry’s 55 revived visiting hopes, but the away side ended 126 all out.
Griffiths took 2-14, Muhammad Khan 2-18, Andrew Watkin and Roett 2-20 apiece for the hosts, who edged a 22-run, 11-4 verdict.
A vital stand of 88 between skipper William Ryan and Dan Evans helped make sure Saints reached the winning post and remained 10 points behind leaders Northop in second place with five rounds of matches left.
Matthew Humphreys stood out with 70 not out as Mochdre set 147-7 off a reduced 35 overs due to rain.
Gareth Goodson snared 3-25 and Danny Ryan 3-30 for Asaph, who hit back with 150-6 off 34.3 to clinch a 12-3 outcome in their favour.
Ryan made 39 and Evans 36, Humphreys 2-17 and Aidan Kelly 2-22 for the home team.
Gethin Thomas made a maiden first-team century and posted a third-best career score of 110 as Pontblyddyn successfully chased down a large score at Chester Road.
Mold were inserted by the visitors and piled up a formidable 254-6 off 50 overs, skipper George Deniz hitting 69 not out, John Crane 64 and Ewan Hill 44, Renacko Belgrave 3-72 for the visitors.
Thomas then took centre stage with his 110 off 111 deliveries, striking 21 fours as Pont made it to 256-7 off 46.2, Dave Evans 42 and Richard Davies 37, Munowar Samsodien gathering a tremendous 6-43 for Mold in a losing cause.
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