Dundee are on a high after beating United in last week's derby
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The Scottish Cup fourth round tie between Dundee and Falkirk has been postponed due to a waterlogged pitch.
Dens Park failed a 10:00 GMT inspection.
It is not the first time Dundee's surface has struggled to cope this season, with a Premiership match versus Celtic postponed for the same reason at the end of December.
East Kilbride's Scottish Cup tie against Lothian Thistle Hutchison Vale has also been postponed.