In the 1999 National League Championship Series against the New York Mets, Pérez, normally known for his defensive skills, became an offensive standout. He hit a home run in Game 1 to help the Braves win 4–2. He followed with a two-run, sixth-inning home run in Game 2 that broke a 2–2 tie. Pérez contributed a two-run single in the deciding Game 6 as the Braves won 10–9 in 11 innings. He totaled 10 hits in 20 at bats for a .500 batting average along with 2 home runs and 5 runs batted in to earn him the League Championship Series Most Valuable Player Award. After an emotionally draining National League Championship series, the Braves were swept by the New York Yankees in four games in the 1999 World Series.