The young reliever learned an important lesson during that rough month.
"Yesterday is already over," Jansen said. "You can't let all that stuff bother you."
More than a year later, Jansen is applying that logic in the closer's role for the Dodgers. Jansen picked up the loss in two of three games this week against the Angels and heading into Friday night, he had allowed a run in three of his previous four appearances.
So when he got the call to close out Friday's game with the Dodgers up by one run in the ninth, Jansen headed to the mound without a thought in his head about his previous outings.
"I just put it behind me," he said. "One thing I learned in this game is that I can't come to the ballpark and think about yesterday. It's history. All I do is come back today and try to be my best."
Jansen said the key to doing that is simply being aggressive and continuing to attack batters. He struck out two White Sox batters and picked up his 11th save in a 1-2-3 inning Friday night to preserve the 7-6 victory.