Part defeated Mervyn King to do so, it was a 10-8 win for the Oshawa native.
He averaged 86.14 in his victory. King led 7-5 but Part dug deep to turn the match on its head to reach the Quarter-Finals.
Also through is David Pallett who defeated Kim Huybrechts and Robert Owen who has shown some form and defeated Ian White to reach his first Quarter-Final.
Click here for the 2018
UK Open Prize Fund breakdown.
Evening Session (7pm)
Fifth Round
Main Stage
John Part 10-8 Mervyn King
Paul Hogan v Gerwyn Price
Jermaine Wattimena v Gary Anderson
Rob Cross v Krzysztof Ratajski
Board Three
Robert Owen 10-7 Ian White
Steve West v Michael Smith
Board Four
David Pallett 10-7 Kim Huybrechts
Corey Cadby v Chris Dobey