Heyward stole second without a throw from Brewers catcher Gregg Zaun, who opted to hold onto the ball rather than risk throwing it away.
When asked about Heyward's running ability before Wednesday's series finale, Braves manager Bobby Cox said he believed the 20-year-old had the potential to steal 20 or more in a season.
"Easily," Cox said. "We just haven't been able to run much. We're always down. And they slide-step him and all that, too."
If the Braves continue to swing the bats the way they did over the first two games at Miller Park, Heyward should see his stolen-base opportunities increase, especially with the way he's been getting on base.
Heyward leads the Braves with a .423 on-base percentage, while batting .300 with eight home runs, 27 RBIs and a .611 slugging percentage.