WASHINGTON — Kris Medlen pitched seven shutout innings in his latest winning performance and Martin Prado's two-run double proved decisive to help the Braves end a four-game losing streak with a 5-1 victory over the Washington Nationals on Wednesday night. Medlen (5-1) allowed seven hits while striking out seven and walking one in his fifth start of the season. The Braves have won 16 consecutive starts behind the right-hander dating back to May 2010.