Doug Slaten (0-1) walked Prado to open the 10th inning, and Prado advanced to second on Nate McLouth's sacrifice bunt. Slaten intentionally walked Chipper Jones - who hit his fourth homer in the third inning - and McCann delivered the winning hit.
Braves players rushed out of the dugout to join him as soon as he rounded first base.
Craig Kimbrel (1-1), who blew his third save in the Braves' 7-3 loss to the Nationals in 11 innings on Wednesday night, struck out the side in the 10th to earn the win.

Atlanta Braves left fielder Martin Prado, right, celebrates hitting a grand slam home run with shortstop Alex Gonzalez (2) during the seventh inning of a baseball game against the Washington Nationals on Thursday in Atlanta. / photo: Associated Press
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