Chasing 248 for victory, Bay were in a strong position at 149-3, but then a flood of wickets meant they lost out to the current champions and Premier leaders at Penrhyn Avenue.
Ormskirk won the toss and decided to bat, amassing a good score of 247-4 declared off 54 overs.
At one stage the visitors were 68-4, but an unbroken stand of 179 between skipper Gary Knight (133 not out) and Thomas Brown (54 no) put them in a much mightier position.
Dulanjala Mendis claimed 2-94 off 20 overs for the hosts, Jack Parry and Charlie Collins taking a victim apiece.
In reply, Bay also found early trouble at 19-3, but then a fine stand of 130 between skipper George Johansen (63) and Will Higginson (63) left them needing under 100 for victory.
However, once both mainstays were gone, it was the beginning of the end for the North Wales side, who finished on 168 all out.
Tobian Bulcock snapped up 5-40 and Scott Lees 3-38 for the winners.
Skipper Ben Slater made a first team career best 123 in guiding Northop Hall to a cracking victory at The Rookery.
Hall were put into bat and built a fine total of 231-7 declared off 44 overs, Slater’s magnificent ton coming off just 80 balls and including 12 fours and five sixes.
Finley Jenkins made the second-highest contribution of 35 not out, as the visitors recovered from 26-3 and 55-4 to post a score of well over 200, Mark Prince with 5-91 for the hosts.
Trinity were then bowled out for 189, opener Liam Sherriff a determined 110 not out, James Hurlin bagging 4-71 off 20 for the victors.
Agony for Prestatyn as they lost out by just two wickets at Beach Close.
Put into bat, the home side set a decent 171 all out, Rhys Jones the standout with 75, Andy Taylor 31, Sanjo Varghese 4-11 for the Liverpool travellers.
Wavertree were struggling on 142-8 in response, but ninth-wicket pair Anvarsha Vahid (22 no) and Bharat Grover got them past the post without further loss.
Skipper Adan Tidswell pocketed a commendable 5-60 off 19 for unlucky Prestatyn.
Top of the table Bay made it five straight wins as they celebrated victory by the skin of their teeth at New Brighton.
The Welsh side posted 131 all out, Tom Roberts 61, then dismissed the hosts for 129, Shay Williams snaring a superb six wickets, Sam Costley and James Jones two apiece.
Michael Williamson (66) and Matteo Evans-Ford (61) were the chief contributors as Northop Hall seconds made 185-3 declared after being asked to bat at Smithy Lane.
In response, Spring View held on for a losing draw at 153-7, Nathan Hicks 2-36, Matteo Evans-Ford 2-41 and Sion Hellen 2-45 for the hosts.
Not a day to remember for Prestatyn seconds as they were skittled out for 64, Ben Williams top-score with 21, and hosts Maghull seconds then eased to 66-1 in 11.4 overs for a nine-wicket triumph.
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