Paul Merson believes that Liverpool may struggle unless Jurgen Klopp picks one player in particular when they face Arsenal this weekend. The Premier League’s top two meet at Anfield, with the winner more than likely to spend Christmas Day at the summit of the table. Darwin Nunez will be looking to end a run of 11 games without a goal in all competitions for the Reds when the Gunners come to Merseyside. Paul Merson thinks Darwin Nunez needs to start against ArsenalThe Uruguayan is yet to really live up to expectations at Liverpool, with 22 goals in 67 games so far. And given the amount of depth…