World champion Luke Littler, just 19 years old, made a dramatic run to the quarter-finals of the World Series of Darts Finals in Amsterdam by defeating fellow Englishman Nathan Aspinall in a best-of-19 match. Trailing 9-8, Littler held throw in the 18th leg and forced a deciding leg. He started the final leg with his seventh perfect score of the match—a 180—and finished with a 58 checkout in just 12 darts, securing a thrilling victory. This was the second time Littler and Aspinall had faced each other in a major tournament. In July, Littler had defeated Aspinall 11-8 in the World Matchplay, during which he famously threw a nine-dart leg in the opening set. Littler said the high-paced style of play suits both players and that they are close friends who push each other to perform at their best. He admitted he struggled in the first two sessions of the match but found his rhythm from 6-6 onwards, ultimately sealing the win. In the quarter-finals, Littler will face Jonny Clayton, the former Premier League champion from Wales. Clayton advanced by beating Japan's Motomu Sakai 10-8. He is one of two Welsh players in the last eight, joining Gerwyn Price, who defeated Canada's Jim Long 10-5. England's James Wade also progressed in the evening session, beating Wessel Nijman of the Netherlands, and will now face Price in the quarter-finals. Earlier on Saturday, world number two Luke Humphries was eliminated in the deciding leg of his last-16 match against Dirk van Duijvenbode. Van Duijvenbode will next face Gian van Veen, another Dutch player who had lost to Littler in January's World Championship final. Other winners in the last-16 included England's Ross Smith and Northern Ireland's Josh Rock, completing the quarter-final line-up. The tournament will conclude on Sunday, with quarter-finals starting at 12:00 BST, followed by semi-finals and the final in the evening session at 18:00 BST. The quarter-final matchups are: Ross Smith v Josh Rock, Dirk van Duijvenbode v Gian van Veen, Gerwyn Price v James Wade, and Luke Littler v Jonny Clayton.