We're grading the biggest free agent signings and extensions, including the defending champs filling a major offseason need.

Here's a look at which undrafted free agents the OKC Thunder has signed, along with signees with Oklahoma ties:

Walker Kessler is headed to the Los Angeles Lakers. The Jazz are trading the 7-foot center to L.A. in exchange for two future first-round draft picks, ESPN reported Wednesday morning. He won’t be their Kessler replacement,

Learn about the entire free agent process including key terminology, free agent types and contract options. Below are some basic facts and things to know about several key terms often used and referred to during the free agency process in the NBA.