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BOSTON (beats by dre) So much for being winless at Fenway Park.

Roger Bernadina's two-out double drove in the go-ahead run and the Washington Nationals held on for a 4-3 win over the Boston Red Sox on Sunday, completing a three-game sweep.

The franchise was 0-9 all time at Fenway before the weekend series began.

'' beats by dre '' Nationals manager Davey Johnson. ''This is a whole new ball club. There's great makeup, great talent on this ballclub. It's only going to get better.''

The Montreal Expos went 0-6 at Fenway before the team moved to Washington and became the Nationals, who were swept 3-0 in a 2006 series at Fenway.

The ''new'' Nationals are unbeaten at Boston's iconic ballpark.

''It shows you we're a good ballclub and that we're not scared of AL East teams. And we're going to come in here and play our best ball,'' said Jordan Zimmermann, who struck out seven in seven innings before Washington's bullpen and bench rallied for the win.

Rookie Bryce Harper, who was out of the starting lineup because of a sore back, ended up scoring the winning run after drawing a walk while pinch hitting in the ninth with the game tied at 3-all.

Harper's back didn't slow him down as he came all the way around from first on Bernadina's double to right with two outs.

''Something in the gap or down the line you better score. I knew it was going to be maybe a close play at the plate, and thankfully it wasn't,'' Harper said. ''I'm just going. Two outs, you don't really need anything.''

Boston manager Bobby Valentine felt Bernadina should have been called out on Alfredo Aceves' 2-2 fastball, which home plate umpire Al Porter called a ball.