"I don't know if they will tell me," Mattingly said. "I already let Mike know that Kersh is good for two [innings], so he's set up. That's his regular day, so I expect him -- obviously he's going to pitch. But he's one of the guys that are going in there rested and really perfectly set up for that game."
Kershaw is 11-2 with a 1.78 ERA, has won eight straight starts and is fresh off of a 41-inning scoreless streak. His main competition for the NL start is Matheny's ace with the Cardinals -- Adam Wainwright -- who is 12-4 with a 1.83 ERA on the season.
"That's Mike's decision," Mattingly said. "We're not lobbying one way or another. I let him know how Kersh feels about it and that he's capable of going two innings. I'm sure Mike's got a lot of people calling. … We've kind of set ourselves up for whatever happens there, and I'd love to see him start, but that's not my decision."
Michael Lananna is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.