Pastornicky made his major league debut on April 5, 2012, as the Opening Day shortstop for the Braves against the New York Mets in New York City. Pastornicky recorded his first hit that day, a triple off of Ramón Ramírez that went over the head of center fielder Andrés Torres. His first home run came on April 10, 2012 against the Houston Astros at Minute Maid Park. He was sent back down to Triple-A Gwinnett after having the lowest fielding percentage among all major league shortstops. He was replaced by Andrelton Simmons who was called up from Double-A Mississippi on June 2, 2012. Pastornicky was designated for assignment on January 8, 2015, and released on March 19.
