"Everybody is sitting down there, and there is really only one defined role, and that's Steve," Koehler said.
In Monday's 15-inning win over the Mets, Koehler threw three scoreless innings, striking out five. Out of necessity, Jon Rauch, mainly used in setup situations, threw three innings.
"We saw Jon go three innings," Koehler said. "That's big. We needed that. That's why he's played a while."
Koehler is a hard thrower from New York who pitched at Stony Brook University. Since being called up from Triple-A New Orleans, he's been effective for Miami, posting 7 1/3 scoreless innings with eight strikeouts.
"For me, I'm just going to try to go out there and throw until they tell me not to," Koehler said. "That's all I can do in the situation that I'm in, and hope for the best."
The right-hander made his big league debut last September, pitching in eight games with one start. He struck out 13 batters in 13 1/3 innings.
"I don't know if I'm missing more bats," Koehler said. "I'd say I'm probably executing a little better, and really sticking to the plan that's in place, and just going from there."
Joe Frisaro is a reporter for MLB.com. He writes a blog, called The Fish Pond. Follow him on Twitter