MIAMI -

Tanner Roark won his fourth consecutive start and the Washington Nationals averted a series sweep by snapping the Miami Marlins' six-game winning streak with a 4-3 victory Wednesday.

For the fourth start in a row, Roark (11-6) allowed one run in seven innings, lowering his ERA to 2.74.

Drew Storen allowed two runs in the ninth before retiring Reid Johnson on a forceout with two on for the final out to earn his first save since August 2013.

Mannager Matt Williams didn't call on closer Rafael Soriano, who hasn't pitched since he blew a three-run ninth-inning lead in Washington's loss Monday.

Jayson Werth, back in the lineup after missing one start because of a sore right ankle, put the Nationals ahead to stay with a sacrifice fly in their three-run eighth. Denard Span stole two bases and scored twice.