Luke Littler has become synonymous with trophies, but one tournament in particular has proved elusive.Of the eight ranked televised events conducted by the PDC, Littler has won four before the age of 19. The latest opportunity to boost that tally to five has arrived, as Littler is amongst the field to compete in this year’s World Grand Prix.It is not a tournament the 18-year-old has happy memories of given his debut at the 2024 iteration ended with Littler being dumped out in the first round by Rob Cross.Despite the chance to close the gap on world No.1 Luke Humphries in the PDC’s Order of Merit, Littler isn’t exactly looking forward to the World Grand Prix.That’s because the tournament features a unique rule in which players must hit a double to start and finish their 501 leg, better known as the ‘double in, double out’ rule.Should a player miss a double with their first dart, they don’t receive a score and their opponent gets to throw.Speaking ahead of the World Grand Prix, Littler did little to hide his disdain for the rule.Why doesn’t Luke Littler like the World Grand Prix’s unique rule?“Obviously it’s (World Grand Prix) the next big one,” Littler said.“I’ll be honest, I didn’t like it. I didn’t like the double start.“I think it’s obviously one of the toughest tournaments to win, with the Worlds, the Matchplay, the Premier League. But the double start: if you don’t get off [to a good start], then you’re in trouble.“I can’t say I really practice the double start often but obviously leading up to it I think I’ll have to, just get used to it. Every year we’ll see someone hit a treble 20 first out and then they forget.GettyLittler has his eyes on the £120,000 prize that awaits the World Grand Prix winner[/caption]“It’ll be tough but we’ve still got plenty of darts to play.”Littler begins his World Grand Prix campaign against the Netherlands’ Gian van Veen on Tuesday.How has Littler performed in 2025?Even though Littler has spoken about his gripes with the unique World Grand Prix rule, he’ll likely forget all about it once the competitive juices are flowing.‘The Nuke’ will no doubt look to maintain the blistering form he has displayed this year at the oche once the action gets underway in Leicester.Of the PDC ranked televised events played this season, Littler has won three and reached the quarter-final at the World Masters.Littler also made it to the final of the World Series Finals and the Premier League of Darts, only to fall at the last hurdle to Michael van Gerwen and Luke Humphries respectively.All up, Littler has won a whopping 13 events across the globe this yearShutterstock EditorialWhich other events is Littler scheduled to compete at?Once Littler’s run at the World Grand Prix ends, the teenager has an extremely busy schedule to round out the year before the World Darts Championship.Now that he is 18, Littler has been able to add exhibition events to his calendar.At present, Littler is scheduled to feature at six exhibitions through to December 6.Following the World Grand Prix, other PDC ranked televised events where Littler is expected to feature include the European Championship and the Grand Slam.