On the other hand, Kinhult birdied his first three holes of the day and added a further birdie and bogey for an outward nine of 33 to get to 11-under, and joined Fleetwood after a final birdie on the par four 15th before making a crucial up-and-down par save at the 18th to force sudden death.
Kinhult skipped the golf green off the tee within the playoff and needed to get pleasure from out of the tough sideways on the way in which to a bogey 5.
The win moves the Englishman to second place on the Race to Dubai in his bid to be named European Number One for the second time, following his 2017 triumph, at next week's season-ending DP World Tour Championship, Dubai.
All of Fleetwood's eagles came on par-five holes, but as was the case all week he battled on the shorter holes and bogeys on 11th, 12th and 16th halted his victory charge, though he still carded comfortably the low round of the day.
"It feels good, emotional", said Fleetwood who won $2.5 million, the biggest first prize in European Tour history before this week's victor claims $3 million.
Wiesberger completed with a 2-below 70 to tie for third with Jason Scrivener and Thomas Detry. Kinhult additionally completed 12 beneath total with a closing 68.
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But Kinhult's errant drive at the last left him with no option but to lay up, and he then went long with his third before keeping his hopes alive with a spirited putt for bogey, only for Fleetwood to produced one of the best pitches of his career before dropping the winning putt in the middle of the cup.
RIGHT: Fleetwood scrambled to make par and defeat Kinhult on the first extra hole.
Louis Oosthuizen was the best placed South African as he finished on three-over 75 to finish T6 on 7-under par.
The win marks the 28-year-old's fifth European Tour victory since January 2018.
"There's only a certain few, come the end of every year, that have a chance of winning the Race to Dubai and three years in I've been lucky to be one of those guys every time. I will give it my all".
Kinhult's performance, although not quite enough, was still a remarkable turnaround after he finished last at the Nedbank Challenge on 15-over par 12 months ago.
"The money is not that important because I guess being a golfer these days you have the chance at a young age to set your family up for life", Fleetwood said. "I've got another week to go, but, with the game having turned from Friday, we are in good shape going into next week". "It's a good week".