Paul Mullin scored twice as Morecambe climbed above hosts Crawley with a convincing 3-1 win.
Rhys Turner put Morecambe on their way with the opener in a flying start to send Crawley diving to only their third home league defeat of the season.
Crawley, winners of four of their previous five home games, made a disastrous start by conceding two goals in the opening seven minutes.
The hosts' defence was caught napping in the third minute when the recalled Turner rose unchallenged to head home a cross from Michael Rose.
Mullin then raced through to double the advantage by slipping the ball under keeper Glenn Morris following a pass by Antony Evans.
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Crawley threatened for the first time when leading marksman James Collins forced keeper Barry Roche to parry his goal-bound shot.
But Mullin, after forcing keeper Morris to save well from his attempted chip, made it 3-0 five minutes before the break with a lob from eight yards which Morris got a touch to but could not keep out.
Crawley had a let-off on the hour when a surging run by Evans set up Lee Molyneux and his low shot flew inches wide.
And Molyneux went close again when his low drive was cleared off the line by Mark Connolly.
Crawley reduced the deficit on 77 minutes when Andrew Fleming brought down substitute Rhys Murphy and Collins stepped up to score for the seventh home game running from the penalty spot.