World number 405 Shinkwin was on course for victory when he stepped up to the 18th tee a shot clear of the clubhouse leader, but the 24-year-old came up agonisingly short with what would have been the winning putt, producing his first bogey of the day at the worst possible time and forcing a play-off.
With a stroke of luck to miss the burn on his approach to the final hole of regulation play, Cabrera Bello finished with a birdie to set the clubhouse lead at 13 under par with a course record of 64.
Britain's Ian Poulter, who shared the overnight lead with Dodt and Shinkwin on nine under, fell away after a 74 left him on seven under alongside American Rickie Fowler, the 2015 victor, and four others.
Fox hit his second ball, his third shot for the hole, straight into the hole for a hole-in-three. "I'm looking forward to tomorrow very much". "I feel a little bit for him because I know how you feel when a tournament just slips".
"Rachel and I were meant to be off to NY tomorrow morning, but pretty happy to be going to Birkdale and my first major", he said.
Padraig Harrington, Anthony Wall, Matt Kuchar and Ryan Fox shared fourth place with Andrew Dodt at eight-under, while Rickie Fowler, Soren Kjeldsen, Lee Slattery, Andy Sullivan and Robert Rock made up the rest of the top 10 in a tie for ninth with Ian Poulter at 7-under. "I've now got enough ranking points to hopefully be in the Race to Dubai at the end of the year and hopefully I can carry on into next week".
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"It's been a very good week and at the end of the day, I'll be more than happy to finish second but the win was on my mind and didn't happen", he said.
"Obviously extremely happy. I had won before and I'd been up there so many times". "And out here, I can't get technical at all about where I want to hit it, what flight I hit, where I want to land it on the green".
"It was a job just to hold onto the umbrella let alone trying to hit a 6 iron from 125 yards, and even that did not get near the pin".
"I really felt I played some of the best golf of my life today".
"I played the same all the time", he said with a smile. "I don't think I've played in wind and rain like that before", he said after a 72.
Not since the scheduled Champions' Challenge at the 2010 Open Championship at St Andrews had to be cancelled has a big event in Scotland witnessed such dire conditions.