One of the most important storylines of the 2009-10 Celtics  season has been Rajon Rondo’s emergence into a full-fledged star. His assists are up, his steals are way up and he has the big contract and All-Star appearance to back him up.
But the true revelation with Rondo this season has been his improved mid-range game. His traditional field goal percentage is up slightly from just over 50 percent to 52.9 percent, but that only tells part of the story. For that we need to turn to Hoop Data , a website that tracks where a player shoots, and how often he makes it.
For stat geeks, Hoop Data is a treasure trove of interesting numbers. For example Glen Davis  has his shot blocked  a fairly amazing 21 percent of the time, which helps explain why he has had so much trouble finishing around the basket.
Back to Rondo. According to Hoop Data’s numbers, he has improved his shooting percentage  at the rim and raised it significantly from 10-15 feet in to the basket. That would be the in-between game so many purists long for.
In 2009, Rondo took a little more than half his shots at the rim and made over 61 percent of them, which is very good for a point guard. This season he has increased his attempts slightly (from 5.1 to 5.4), and also improved his percentage to over 65 percent. That meshes with how most people see Rondo–as a player who can get to the basket and finish well despite his size.
To give you an idea on how that compares to other point guards, only San Antonio’s Tony Parker  takes as many shots per game and finishes as well as the rim as Rondo.
Rondo’s real work has come slightly farther out. From 10 feet and in, Rondo’s accuracy goes from 40 percent in 2009 to 53 percent in 2010. From 10-15 feet away from the basket, Rondo’s percentage jumps from 35.2 to 52.5 percent. He has also upped his attempts from those distances over the previous season.
What all that shows is a player understanding how to utilize his ability to beat defenders off the dribble, and how to score once he does.
It’s not all good news for Rondo. His accuracy on longer shots and 3-pointers has dropped, as has his free throw shooting, which is a genuine cause for concern since it removes him from late-game situations. Rondo may never be a great long-range shooter, but if he can continue to master the in-between game–and get his free throw shooting up to a respectable level–he won’t have to be one to be effective.