By Andy Dunn If Erik ten Hag was feeling the heat – even in the bitter Wigan chill – you could not tell. Under a woollen, rather than tin, hat, the Manchester United manager stood impassively for most of a one-sided tie. Even when Diogo Dalot opened the scoring with a lovely hit just after the 20-minute mark, Ten Hag’s expression barely changed. But make no mistake, he knew the importance of this win, he knew the importance of this performance. Anything other than victory at the DW Stadium would have turned critical scrutiny into ridicule – and that is normally the beginning of the end. Just o…