Rain is in the forecast on Thursday afternoon as the Washington Nationals are slated to host the Arizona Diamondbacks in the finale of the four-game series. If the game is not played there is always a chance Arizona would have to return to Washington and play Monday if the game has a bearing on who gets the homefield edge in the playoffs between the Nationals and Los Angeles Dodgers in the NLDS that begins October 7. Washington, which lost 3-0 on Wednesday in a game called due to rain in the sixth, was two games ahead of the Dodgers going into play Wednesday.