Officials had already taken steps to get play finished before "bad weather" was supposed to hit the Ayrshire coast around 4pm.
As the competition nears its conclusion on Sunday, Poulter is bang in the mix, sharing a -9 share of the lead with fellow Englishman Calum Shinkwin and Aussie Andrew Dodt.
This trio are two shots clear of Andy Sullivan on a windswept and rainy day on the Scottish west coast.
Park, who birdied the 15th to move into a tie for the lead and the 17th to open a two-shot edge after Choi made a double bogey on the previous hole, finished at 11-under 277 for a two-stroke win over Choi.
The last of Poulter's 14 global victories was in November 2012 at the WGC-HSBC Champions in China.
Fox carded a final round two under par 70 to finish on 8 under, five shots behind the victor, Spain's Rafa Cabrera-Bello.
"Today I truly believed that it could be my day".
"Not the only hole-in-three I've heard of, a mate had one back home".
Shinkwin was trying his best to be as phlegmatic as possible, concluding that "it's been a very good week and at the end of the day I'm more than happy to finish second, although of course the win was on my mind". "I feel a little bit for him because I know how you feel when a tournament just slips". I'm in a great position and the buzz is there.
Ten days ago, the sometimes outspoken English golfer brilliantly let his clubs do the talking in qualifying for next week's British Open where in 2008 he recorded a career-best finish in all of his 53 Major showings of second.
"I was very happy, I really gave it a go in the playoff and it worked out for me".
"Of course I was nervous but to be fair it was nothing like what everyone probably thinks". "It was brutal out there but I managed to grind it out".
Matthieu Paven posted a six-under 66 on Sunday to end up solo third at 10-under-par and secure the other spot at Royal Birkdale next week along with Shinkwin and Dodt, with Dodt having to cancel the trip to NY he'd planned with his wife to take up his spot at his first major tournament. Booking a Royal Birkdale berth will force his plans for next week to be changed.
Australian Andrew Dodt, who was planning to travel with his wife to NY on Monday for a five-day holiday, secured the final British Open place and his maiden appearance in a major by carding a final-round 73 to end in a five-way share of fourth at eight under.