The Natural: Gattis hits first career grand slam, Braves rout Twins 8-3 for 6th straight win

Atlanta Braves' Evan Gattis, right, high-fives teammate Ramiro Pena after hitting a grand slam in the fourth inning of a baseball game as Minnesota Twins catcher Ryan Doumit, center rear, stands at home plate, Wednesday, May 22, 2013, in Atlanta. (AP Photo/David Goldman) (The Associated Press)

Atlanta Braves' Evan Gattis hits a grand slam in the fourth inning of a baseball game against the Minnesota Twins, Wednesday, May 22, 2013, in Atlanta. (AP Photo/David Goldman) (The Associated Press)

Evan Gattis kept up an amazing rookie season with his first grand slam, B.J. Upton and Ramiro Pena also homered, and the Atlanta Braves finished off a sweep of the woeful Minnesota Twins 8-3 Wednesday.

The Braves stretched their winning streak to six games and made things easy for Paul Maholm (6-4), who allowed an unearned run in 7 1-3 innings.

Gattis struck less than 24 hours after his two-out, pinch-homer in the ninth allowed the Braves to pull out a 5-4 win over the Twins in extra innings. Swinging on a 3-0 pitch with the bases loaded in the fourth, he launched an opposite-field drive just inside the right-field pole.

Vance Worley (1-5) gave up eight runs in 3 2-3 innings in the Twins' eighth straight loss.