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Sir Alex Ferguson is convinced Saturday's win at Sunderland will prove to be a watershed in Manchester United's season. After sweeping all before them on their return from the Club World Cup in Japan, United have suddenly hit an alarming slump. Ferguson admitted goalkeeper Ben Foster made another mistake at the Stadium of Light. But it was the only thing that went wrong in a narrow 2-1 win at Sunderland that United's wily manager feels will mark the point in his side's season when confidence began to return. "It was a watershed," said Ferguson. "The back four played very well and restricted Sunderland to only a few chances because we dealt with their crosses terrifically. Ben is young and inexperienced but apart from that one mistake, the defence was very good. Hopefully from now on we will be fine."