Two first-half goals set up Cymru Premier hosts Caernarfon for a place in the quarter-finals at the expense of their third-tier visitors Llannefydd.
Captain Osian Evans broke the deadlock on 36 minutes from an Adrian Cieslewicz assist, before the skipper turned supplier for Jake Canavan to make it 2-0 in the 45th.
Caerrnarfon supporters had to wait until the 86th minute for the third goal courtesy of 17-year-old debutant substitute Monti Ellis.
A Davies double sent the Bay through after a good battle with Cymru North underdogs Rhyl.
With new Lilywhites manager Barry Owen in charge for the first time, the visitors went a goal down after eight minutes when Jordan Davies netted his sixth goal of the campaign from an Ethan Roberts assist.
Adam Davies doubled the lead on 59, Sam Hart setting him up.
Ten-man Cymru Premier hosts Llandudno needed penalties to scrape through against Cymru North hopefuls Bangor.
It was quite a moment for City youngster Sam Parry when the 18-year-old opened the scoring against his former club on 10 minutes.
Ben Maher levelled for Tudno from a Marc Williams assist after 19, but Corrig McGonigle restored the Citizens’ lead with 26 on the clock.
Callum Stephens made it two apiece after 35 before the Seasiders found themselves a man down after Harvey Bennett was red-carded on 38.
Ross Weaver edged the 10-men in front for the first time in the 57th minute, but a Jack Burman leveller from a Parry assist brought Bangor back on terms.
It ended up going to spot-kicks and City were off-target twice,enabling the hosts to take a 4-1 verdict and a home clash with Prestatyn Town in the last eight.
An all-Ardal North West clash went Llangefni’s way.
Cefni were three-up inside the first 15 minutes, Ifan Mansoor, Math Jones and Osian Jones all on the mark.
New signing Dion Jones hit back for Phoenix on 20 and 3-1 was how it stood at the interval.
Jay Sutton raised Pen’s hopes when he bagged their second on 80 minutes, but Town held on for a quarter-final berth.
Prestatyn booked a visit to Llandudno in the quarters after seeing off fellow Ardal North West side Pwllheli at Bastion Gardens.
A Calyn Spencer penalty on 40 minutes put the Seasiders in front, then early in the second half, Casey Faulkner doubled the lead.
Pwllheli ended up with nine men after captain Josua Jones was red-carded on 80 minutes and Jack Jones was dismissed for a second yellow deep into stoppage time.
Prestatyn sub Jordan Worthington also saw red after 80.
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