Martin injured his left oblique while warming up before the top of the eighth inning and left the game before he had even thrown a pitch. He was scheduled for an MRI on Friday.
Martin has been replaced on the NLDS roster by right-hander Julio Teheran. Martin is now ineligible for the NL Championship Series, should the Braves advance, as well as the rest of the NLDS.
"It's not a good position I put those guys in," Martin told reporters, according to MLB.com. "It's tough to come in for an inning like that and have to rush to get ready in front of everybody, especially in a freakin' playoff game like this. It's tough. I feel really bad."
"We had the whole thing set up right where we wanted it," Braves manager Brian Snitker said. "[Losing Martin] was a big blow."
Martin was acquired from the Texas Rangers in a trade-deadline deal. In 20 appearances over 17⅔ innings, he posted a 4.08 ERA.