Luke Littler’s mum has appeared to show her agreement with Wayne Mardle for the way the 17-year-old responded to his altercation with Ricardo Pietreczko at the Belgian Open. Littler marched on to win the Belgian Open on his European Tour debut after hitting a nine-darter in the final against Rob Cross. -darter in the final against Rob Cross.The final went all the way to a deciding leg in a nail-biting finish – but it was Littler’s semi-final clash earlier in the day that caused an even bigger stir. The teenage darts sensation went up against Pietreczko, nicknamed ‘Pikachu’, and eased to victor…