Nationals beat punchless Diamondbacks

      WASHINGTON (AP) - Jayson Werth hit a three-run homer, Ross Detwiler took a four-hitter into the seventh inning and the Washington Nationals beat Arizona 4-1 Monday night to extend the Diamondbacks' losing streak to a season-high six games.

      Henry Blanco homered for the Diamondbacks, who have scored only seven runs in their last six games. Mired in its longest skid since a seven-game run in July 2010, Arizona now leads second-place San Francisco by just one game in the NL West.

      Werth has had few shining moments this season after signing a $126 million, seven-year deal in December. But he carried the Nationals in this one, scoring a second-inning run before delivering the decisive blow in the fourth against Joe Saunders (8-11).