The longest regular-season game in Nationals history — and the second longest in the Majors this season — ended up as a 2-1 win for the Pirates after Starling Marte hit a solo homer in the 18th inning on Sunday at Nationals Park. The victory by Pittsburgh ended Washington’s five-game winning streak. The Nats are now six games ahead of the Marlins and Mets in the National League East race.