In Amsterdam, nineteen-year-old world champion Luke Littler faced the kind of moment that separates great talent from great character — trailing 9-8 with elimination near, he steadied himself, held serve, then broke his opponent's throw with a composed 12-darter to win 10-9. The victory over Nathan Aspinall carries him into the quarterfinals of the World Series of Darts Finals, where a clean sweep of professional darts' premier events in a single year now waits as a possibility. Youth, it seems, is no obstacle when the nerve holds.