"This is the last game of the season, and I can't look back," the Cubs closer said on Wednesday. "I have to look ahead to next year."
Marmol will finish with 34 saves, but he also leads the National League in blown saves with 10. The right-hander knows he has to get back on track.
"I don't want to lose my job," he said. "This is something I want to do, this is my career."
Another year with pitching coach Mark Riggins may help. Marmol said he missed Larry Rothschild, who left the Cubs to take a similar position with the Yankees.
"To be honest with you, yes, [I missed Rothschild]," Marmol said. "He's known me for a long time, and he knows everything I do on the mound. Riggins will learn my mechanics."
But the biggest thing Marmol has to do is correct himself when he's out of whack. He'll spend more time throwing this offseason and working out.
"I have to do it," he said. "I think I can do it next season. I'll be ready for next season."