Chisnall hit eight 180's on his way to the win with a 98 average and 34% on the doubles as he set up a mouth-watering clash with Gary Anderson.
He averaged 106 in the first two sets not giving Lewis a chance but when Chisnall started to play worse, Lewis couldn't take advantage and claw his way back.
This was shown with Lewis almost mirroring 'Chizzy's averages after the first two and especially in the decider for Chisnall to go 3-0, he missed four set darts which was definitely the turning point.
Lewis will definitely rue his missed chances but will be glad of the run he has had especially considering a poor year since reaching the penultimate round last year.
As for Chisnall; with Anderson having a documented bad back again, could it be the St Helens ace's year??
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Evening session schedule
Michael Smith (99.72) 4-1 Ryan Searle (96.22) (R4) (3-1, 3-2, 3-0, 2-3, 3-2)
Dave Chisnall (98.5) 4-0 (93.75) Jamie Lewis (R4) (3-2, 3-1, 3-2, 3-1)
Rob Cross vs Luke Humphries (R4)
https://twitter.com/OfficialPDC/status/1078761415064743936