Yes, the sample size is very small. There are a number of problems with that. However, his OPS has been 58 points higher after he has a day off. This issue regarding Kendall has been brought up before, along with the meaning (or lack thereof) attached to the "Day Off" stats, but I figured I'd take a look, and now you can too.
|Not After Day Off||After Day Off|
EDIT: Here's 2009. Different verse, same as the first. He was rested more frequently (30% of games vs 19% so far in 2010). Higher AVG, OBP, SLG, but this time he K'd less frequently after a day off.
|2009||Not After Day Off||After Day Off|