O'Connor showed some excellent finishing work, as he hit 75 percent from his darts on the doubles. It helped the Irishman to beat Mensur Suljovic 6-3.
He will meet Boulton in the semi-finals. 'X Factor' came back from a 3-5 deficit against Gerwyn Price, before he claimed the win in the decider with a 15-dart leg.
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PDC European Tour.
Schedule of Play Sunday July 1 Third Round
Afternoon Session (1pm local time, 12pm BST) Michael van Gerwen (101.33) 6-1 (83.70) Robert Thornton
Ian White (100.15) 6-2 (92.82) Darren Webster
Joe Cullen (92.64) 4-6 (92.44) Justin Pipe
Daryl Gurney (95.88) 5-6 (95.00) Stephen Bunting
Jelle Klaasen (78.19) 1-6 (92.44)
Andy Boulton Jason Lowe (93.44) 2-6 (98.82) Gerwyn Price
Mensur Suljovic (104.60) 6-2 (92.39) Paul Rowley
William O'Connor (90.27) 6-5 (85.33) Kim Huybrechts
Evening Session (7.15pm local time, 6.15pm BST) Quarter-Finals Michael van Gerwen (104.82) 6-4 (94.31) Ian White
Justin Pipe (87.45) 3-6 (92.05) Stephen Bunting
Andy Boulton (85.55) 6-5 (87.31) Gerwyn Price
Mensur Suljovic (101.28) 3-6 (96.35) William O'Connor