Arsenal cut Chelsea's lead in the Women's Super League back to three points with a 3-nil victory at Brighton yesterday.
It was the north London side's fifth straight top flight win.
Manchester City are up to third, replacing United after getting past their rivals 3-1 at Old Trafford.
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Elsewhere, fifth-placed Tottenham were held to a 1-1 draw by Leicester, bottom side Bristol City clinched a 2-2 draw away to Everton and Aston Villa edged out fellow strugglers West Ham 3-2.
