Liverpool have seen some excellent performances from young players during pre-season so far. The Reds took a very fresh-faced squad to the USA to play against Real Betis, Arsenal and Manchester United. With so many of the first-team squad still away on holiday, there was a chance for some youngsters to lay down a marker with Arne Slot. During Saturday’s game against Betis in Pittsburgh, it was 17-year-old Trey Nyoni who really stood out for Liverpool. And though Nyoni was tidy again in a 45-minute appearance against Arsenal on Thursday, it was a fellow Liverpool academy graduate who shone in P…