There has been some concern about a loss of velocity in the last couple of Harden's starts so after some hiccups with my code here I wanted to take a look with the PITCHf/x data to see if I could spot anything.  Here is his fastball wear pattern for the year.

via baseball.bornbybits.com

You can see that there was a serious dip in velocity two starts ago but that seemed to return for his start on Sunday.  It looks like his arm angle was wide that day as his horizontal movement really was out of whack as well.  This doesn't look like an impending problem to be but with Harden sometimes it is hard to tell.