Littler added his name to the illustrious roll of honour in the double-start event with a 6-1 success against Humphries, who was featuring in his third consecutive final at the Mattioli Arena. The World Champion won each of the opening four sets in deciding legs to establish a commanding cushion, before Humphries produced a timely burst to open his account in set five.
However, Littler restored his four-set buffer with a blistering sixth set surge, before capping off a merciless display to pocket the £120,000 top prize. Littler produced a series of superb performances to triumph in the East Midlands, overcoming Gian van Veen, Mike De Decker, Gerwyn Price and Jonny Clayton earlier in the event.
The Warrington wonderkid has made no secret of his desire to overhaul Humphries and claim the world number one spot, and his exploits in Leicester have taken him to within £70,000 of his World Cup partner.
Humphries, meanwhile, was unable to add a second double-start title to his extensive trophy haul, having joined Phil Taylor and Michael van Gerwen in reaching three successive World Grand Prix finals.
The world number one defeated Nathan Aspinall, Krzysztof Ratajski, Cameron Menzies and Danny Noppert to progress to Sunday’s showpiece, and he was full of praise for Littler post-match. Littler drew first blood in a topsy-turvy opening set, before defying a 104 average from Humphries in the second to double his advantage.
Humphries fired in legs of 13 and 11 darts to force a decider in set two, only for Littler to follow up a superb 177 with a clinical 64 kill on tops to extend his cushion. The Warrington wonderkid then came agonisingly close to a slice of World Grand Prix history to kick off the third stanza, missing the bull for a double-start nine-darter.
Littler would have become only the fourth player to achieve perfection at this event, although the irrepressible teenager continued his charge with a 104 checkout to wrap up set three.
Humphries refused to relent, converting 149 and 110 finishes to round off back-to-back 12-darters, but it still wasn’t enough to open his account, as Littler won through a decider for a fourth successive set to lead 4-0.
The world number one finally got his reward in the fifth, producing a magnificent 154 finish to avert the prospect of a whitewash, yet a brilliant 11-darter from Littler in the latter stages of set six which saw him restore his four-set buffer.
The 18-year-old was in no mood to offer Humphries a route back into proceedings, and despite Humphries forcing another set decider, Littler followed up 98 and 111 combinations with a 14-darter on tops to celebrate World Grand Prix glory.
2025 BOYLE Sports World Grand Prix
Sunday October 12 (2000 BST)
Final
Luke Littler 6-1 Luke Humphries (3-2, 3-2, 3-2, 3-2, 1-3, 3-1, 3-2)
Best of 11 sets