Manchester United host Manchester City in a firecracker of a game on Saturday lunchtime – and Paul Merson has offered his prediction on which way he thinks the contest will go.Erik ten Hag side’s go into the match in fantastic form. They have won all six of their games since returning to action after the World Cup, and are on a run of 11 wins from 12 games in all competitions either side of that break. That form has carried United back into the top four – and a win over their derby rivals can move them to within a point of Pep Guardiola’s si …