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**DC United head to Nashville looking to spoil the Shield party.** • **DC United** face Nashville SC tonight in a crucial MLS road test • **Nashville SC** sit atop the Supporters' Shield race but Callaghan admits improvement is needed • **DC United** enter as underdogs with a chance to play spoiler against the league's best • **Nashville** have been the class of MLS but cracks are showing per their own coach **Watch for:** Whether DC can exploit Nashville's acknowledged weaknesses and steal points on the road. The lineup's set. Drop in.