The Braves placed left-hander Martín Pérez on the 15-day injured list with lower back inflammation, leaving Atlanta short-handed in its starting rotation as the postseason approaches. Pérez, 9-9 with a 3.04 ERA in 26 starts this season, likely would not be available until the NL Championship Series, according to Braves manager Walt Weiss. RHP Elieser Hernández (2-0, 2.45) was recalled from Triple-A Gwinnett to replace Pérez on the roster.