Wednesday's game between the Washington Nationals and Los Angeles Dodgers is now back on after initially being postponed. Early Wednesday afternoon, the Dodgers announced the game was postponed due to rain. However, the Nationals never confirmed this and just sent out a notice that the game will indeed be played as scheduled.
Via the team's official Twitter account.
Gates open at Nationals Park for Nats-Dodgers game. We'll continue to monitor weather w/updates here & nationals.comless than a minute ago via Social Marketing Hub 
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Why the confusion? According to Adam Kilgore of the Washington Post, MLB stepped in and asked the two teams to try to play.
The Nationals and Dodgers agreed earlier today to postpone tonight's game and play a doubleheader involved, and the Dodgers, on their official Twitter feed, announced that as the plan.
But MLB stepped in and told the teams to wait and try to play the game. The league did not want possible rain tomorrow to prevent the teams from playing, because the Dodgers will not have a chance to make the game up.
Neither team is in a pennant race, so I'm not sure why there was such urgency, but there you go.