The first name that comes to mind when talking not playing up to their worth,
Tyler Myers, who only has a year remaining on his contract with a $6M AAV. Though it appears he won't be the first one, since $5M of his yearly $6M salary will be paid in bonus. Leaving only $1M to be paid over the year with a $6M, which will be extremely interesting for team that need help reaching the cap floor (ie: Arizona). So there might be a trade market for Myers after July 1st.