Hilton Cartwright and Joel Paris have powered Western Australia to a five-wicket win over NSW in the one-day cup final, securing a historic third straight title.

The recent dominant force in domestic cricket, WA set up their latest limited-overs victory when they skittled the hosts for just 169 at Sydney's Cricket Central on Sunday.

Left-arm quick Paris (4-21) led the rout in his first one-day appearance of the season, with Ashton Agar (2-35) and AJ Tye (2-39) also claiming multiple wickets.

It wasn't all smooth sailing in the run chase as WA were given a huge scare when reduced to 3-30 in the eighth over.

Blues quicks Ben Dwarshuis (1-43), Jackson Bird (1-27) and Jack Edwards (1-22) claimed early wickets before Cartwright (73 not out) joined opener Josh Philippe (42) at the crease and steadied the innings.

Cartwright stepped up with his first half-century of the season — the eighth of his career — to lead all scorers and steer the visitors safely past the victory target with Nick Hobson (26 not out).

WA reached 5-170 with more than 16 overs to spare when Cartwright blasted the third six of his 80-ball innings out of the ground.

He also hit seven fours and was named player of the match.

"NSW had the momentum when I walked out there to bat and at that time it was just about rotating the strike between me and Josh Philippe," Cartwright told reporters post-match.

"As soon as we grabbed that momentum we started running with it and got a small partnership.

"We knew as soon as we got to 130 or 140 it would break the game open for us, so it was just about that initial break of momentum against their bowlers."

WA are only the second state to claim a hat-trick of one-day titles and first in more than two decades, since NSW did it for the second time in 2001-03.

It was WA's sixth one-day title in the last decade and a record-extending 17th overall since the competition began in 1969.

"A lot of us are getting towards the tail ends of our careers and you understand how much these moments actually mean," Cartwright said.

"I know it's five of the last seven (titles) but in the moment it certainly doesn't feel like that and you take them as good as gold."

NSW were sent in to bat in Sunday's final and reached a healthy position when top-scorer Oliver Davies (51) and Moises Henriques (32) put on 74 for the fourth wicket.

But captain Henriques fell when Agar claimed a sharp return catch off his own bowling, triggering a collapse.

NSW lost their last seven wickets for just 34 runs and were bowled out in just 42 overs.

WA will seek more silverware when their Sheffield Shield campaign resumes in March, having won the four-day competition in the past two seasons.

AAP