WASHINGTON — Justin Upton led off the eighth inning with a tiebreaking homer, and the NL East-leading Atlanta Braves extended their winning streak to a season-high 11 games by beating the fading Washington Nationals 3-2 Monday night. Freddie Freeman drove in Atlanta's first two runs with a pair of singles in the third and fifth. Reliever David Carpenter (3-0) earned the win by retiring all five batters he faced.