It?s the start of a series between a pair of NL East rivals down in South Beach. The division leading Washington Nationals open a three game series against the Miami Marlins Monday night. Washington missed a chance at a four game sweep of the Mets as they fell 5-1 in the finale on the road Sunday afternoon. Miami dropped the rubber game of their weekend road set with the Braves, losing in walk-off fashion for the second straight day, 5-4, Sunday. The Nationals took two of three the first time the teams met this season, which came in Washington April 3-6.