From the opening leg, Littler was reaching ridiculous levels.
He broke immediately with a 14-darter and never allowed Suljovic a foothold, rattling in maximums with casual ease and dismantling the Austrian's deliberate rhythm without the slightest hint of irritation. By the end of the first set, Littler was averaging close to 110, had won all three legs and missed just a single dart at double.
The second set was even more brutal, as Littler reeled off another three legs without reply, finishing 101 and 105 with total authority and pinning doubles inside two visits whenever required.
At one stage, Suljovic was averaging close to 98 and still had not thrown a dart at a double, such was Littler's ruthless efficiency on the Austrian's throw. Two of the breaks arrived in 12 darts or fewer, underlining just how emphatic the control was.
Suljovic briefly found oxygen in the third set, capitalising on a rare lapse from Littler to land his first leg of the match and momentarily engage the crowd. It changed nothing.
Littler responded with a superb 124 checkout to close the set, roaring in celebration as he preserved his record of not having dropped a single set in the tournament.
The fourth set followed the same script. Littler piled in his ninth 180 of the match, marched to a finish and, after briefly untidying an 81 checkout, calmly returned to pin double three with his final dart.
The match ended with Suljovic stranded once again, effectively a spectator.
Littler finished with nine maximums, multiple ton-plus checkouts including 124, 114 and 105, and an average that hovered well north of the ton before settling on 107 for the match. Suljovic, for all his experience and tactical nous, simply could not disrupt the tempo or find sustained access to the outer ring.
Littler has now won all four of his matches without dropping a set, and performances like this are beginning to shift the narrative from prodigious to ominous. He faces either Rob Cross or Damon Heta in the last 16.
'Packed enough clothes'
"I'm very happy with it, the finishing was good," Littler told Sky Sports.
"I don't think I've seen 71 per cent (checkout percentage) in my PDC career.
"I am happy with that. I felt so settled tonight. Mensur at his pace, I got myself into a rhythm that matches him. It was a bit slower than usual, but it worked out.
"That's the best I've felt this year or even in last year or the tournament before that. That's the most I've been settled.
"It shows in the average, the finishing at the ton-plus checkouts.
"Like we do every year, we always pack enough clothes to the final.
"Last year was different. This year, you're the reigning champion and world No 1, and the pressure is on you.
"Tonight there was no pressure, no nerves, and I'm happy with the result."
Hurrell humbles Bunting
James Hurrell produced one of the shocks of the World Championship so far by knocking out world number four Stephen Bunting in a pulsating seven-set battle, prevailing 4-3 after outlasting the highest seed to fall at Alexandra Palace so far.
Hurrell set the tone immediately, breaking early and claiming the opening set with composed finishing, including a tidy Shanghai-style 120 checkout that hinted this would be no wide-eyed cameo.
Bunting, reportedly struggling with illness, showed flashes of his class but never quite settled, his scoring spiking only intermittently as Hurrell continued to apply pressure with heavier, more consistent visits.
The match quickly developed into a tug of war. The former world semi-finalist repeatedly dragged himself back with moments of outrageous quality, none more so than a sensational 161 checkout of treble 20, double 17 and bull to steal the second set from under Hurrell's nose.
It was the first of several times Bunting plucked a set from the fire with elite finishing, later repeating the trick with a nerveless 121 on bull, treble 13 and double 16 to edge another deciding leg.
Yet each time Bunting surged, Hurrell refused to retreat. The Hillbilly continued to win the statistical battle, maintaining an average close to 100, outscoring Bunting on the 180 count and repeatedly forcing the favourite into awkward checkouts.
His fourth-set whitewash levelled the contest at 2-2 and marked a turning point, Bunting’s resistance becoming increasingly reliant on isolated heroics rather than sustained pressure.
The sixth set appeared to offer Hurrell his moment. Averaging north of 105 in that stanza, he broke and held to move one leg from victory, only for nerves to creep in as Bunting roared back, pinning tops from 100 to force a deciding seventh set amid a crowd suddenly convinced the comeback was complete.
The final set, however, belonged to Hurrell. He broke at the perfect time as Bunting's scoring dipped once more, then calmly closed out the match with a clinical 100 checkout on tops, sealing a performance that was as controlled as it was courageous.
Hurrell finished with an average of 98 to Bunting’s 91, winning 18 legs to 12 and leaving no doubt as to who had been the better player across the distance.
For Hurrell, this was the biggest night of his career so far, a statement win that sends him into round four brimming with belief and facing either Martin Schindler or Ryan Searle next.
Harrysson continues fairytale run
Andreas Harrysson continued his remarkable World Championship run with a 4-2 victory over Ricardo Pietreczko, surviving wild momentum swings, a barrage of maximums and a moment of pure theatre to reach the fourth round at Alexandra Palace.
Harrysson struck early, taking the first set despite Pietreczko applying steady pressure, the Swede converting his chances efficiently while his opponent laboured on key doubles.
The second set swung sharply the other way, 'Pikachu' hauling himself level in dramatic fashion with a monstrous 158 checkout of treble 20, treble 20 and double 19, a finish that rescued a set he appeared destined to lose and momentarily flipped the atmosphere inside the arena.
Harrysson dominated the third set 3-0, producing heavier scoring and tidier finishing to reassert control, before the match descended back into chaos.
Pietreczko again refused to fade, breaking back with a 116 checkout and scrapping his way to parity at two sets apiece, his resilience keeping the contest finely balanced despite being second best for long stretches.
The fifth set proved pivotal. Harrysson, averaging comfortably in the high 90s by this point, found another surge of scoring, breaking throw and then pinning tops under pressure to move 3-2 ahead.
Pietreczko's trebles deserted him at precisely the wrong time, and the Swede seized the opening with increasing confidence.
Harrysson closed the match in a controlled fashion.
A crucial break, sealed with a clinical 146 checkout via double 16, left him one leg from victory. Pietreczko threatened late resistance but could not find the decisive dart, and Harrysson calmly finished on double 19 to complete a performance built on nerve and timely execution.
Harrysson finished with six 180s and an average in the high 90s, repeatedly striking when the match threatened to slip.
A fourth-round meeting with Jonny Clayton now awaits, with a place on the professional tour and a potentially life-changing quarter-final berth within reach.
Saturday evening session results:
Andreas Harrysson 4-2 Ricardo Pietreczko
Stephen Bunting 3-4 James Hurrell
Luke Littler 4-0 Mensur Suljovic