By Matt Maltby Luke Littler suffered a heartbreaking defeat on the second night of Premier League Darts as Michael van Gerwen triumphed in a mouthwatering final in Berlin. Having lost in the semi-final to eventual winner Michael Smith on the opening night of Premier League Darts in Cardiff last week, Littler, 17, was on a mission to bounce on Thursday night. He overcame Rob Cross and Luke Humphries, who beat him in the World Darts Championship final last month, but ultimately came up short in a nail-biting final against the legendary Van Gerwen, who won 6-5. Littler had the chance to wrap up v…