http://espn.go.com/espn/otl/story/_/id/10852199/challenge-donald-sterling
From ESPN
Q: Sterling is notoriously litigious. Can he go to court to stop Silver from punishing him?
A: Not effectively. When Silver issues his punishment to Sterling, the decision is final. The constitution provides in Paragraph 24(m) that a commissioner's decision shall be "final, binding, and conclusive" and shall be as final as an award of arbitration. It is almost impossible to find a judge in the United States judicial system who would set aside an award of arbitration. Sterling can file a lawsuit, but he would face a humiliating defeat early in the process. There is no antitrust theory or principle that would help him against Silver and the NBA. He could claim an antitrust violation, for example, if he were trying to move his team to a different market. But under the terms of the NBA constitution, he has no chance to succeed in litigation over punishment.