WASHINGTON — Order another round for Atlanta Braves manager Fredi Gonzalez, who has learned that a winning streak can be tough to swallow. The Braves won their 13th straight Wednesday night, summarily dismissing the Washington Nationals 6-3 to complete a three-game sweep and take a staggering-for-early-August 15 1/2-game lead in the NL East. Now Gonzalez will have to keep drinking up.