During Game 6 of the 2010 American League Championship Series against the New York Yankees, Feliz got the final three outs in the 9th inning and sent the Rangers to the World Series for the first time in franchise history. On October 30, 2010, he went three up, three down to close a 4–2 Rangers win in Game 3 of the World Series, making him the second youngest player to record a save in the World Series. The Rangers lost the World Series to the San Francisco Giants in 5 games.