The latest chapter in the storied rivalry between the New York Red Bulls and D.C. United will see the two sides collide in the Eastern Conference semifinals. 

The last time the Atlantic Cup rivals played each other in the postseason was 2012, when the Black and Red won a famous, snow-infused series 2-1 on aggregate. 

Snow is not in the forecast for Sunday's first leg at Red Bull Arena, but a spirited affair between two of the oldest clubs in the league is in the cards. 

Here is a look at the key issues that will shape Sunday's match at the home of the Red Bulls.

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