Stephen Strasburg and the Washington Nationals are playing well at the right time. Strasburg pitched seven strong innings to help the NL-leading Washington Nationals to a 2-1 win over the Miami Marlins on Sunday for a four-game sweep. ''Just have to keep the train rolling,'' Strasburg said. Nate Schierholtz and Anthony Rendon drove in runs for the Nationals (91-64), who completed an 11-game road trip 9-2 and lead the Los Angeles Dodgers (88-67) for the best record in the National League.