Donald Sterling isn't done fighting yet.

The banned Los Angeles Clippers owner has filed a lawsuit against the NBA asking for damages in excess of $1 billion.

The lawsuit was filed Friday in U.S. District Court in Los Angeles, just hours before the NBA announced that it had approved Shelly Sterling and the Sterling family trust's deal for the Clippers with former Microsoft executive Steve Ballmer, who bid $2 billion for the team. That deal now must be approved by the NBA Board of Governors.

The league responded later Friday.

"Mr. Sterling's lawsuit is predictable, but entirely baseless," NBA Executive Vice President and General Counsel Rick Buchanan told ESPN.com's Darren Rovell. "Among other infirmities, there was no 'forced sale' of his team by the NBA -- which means his antitrust and conversion claims are completely invalid. Since it was his wife Shelly Sterling, and not the NBA, that has entered into an agreement to sell the Clippers, Mr. Sterling is complaining about a set of facts that doesn't even exist."

As part of the sale agreement, Shelly Sterling and the Sterling family trust agreed not to sue the NBA and to absolve the league of litigation by others, including Donald Sterling.

Since the agreement between the NBA and Sterling trust was announced after the lawsuit was filed in court, Donald Sterling's attorney, Max Blecher, said he needed to review all the new information before proceeding.

"We gotta sit down and see how all of this affects us," Blecher told ESPN.com's Ramona Shelburne. "We have to think through the whole situation. ... She's saying if you sue us, we'll have to pay out of our own money. It's like suing themselves. We have to see whether the law allows to happen.

"We have not had a chance to analyze or do any legal research about it. There's a lot of stuff happening in a very compact period of time. Give us a break."

Blecher had told Shelburne earlier on Friday that the lawsuit addressed the "invasion of (Sterling's) constitutional rights, violation of antitrust laws, breach of fiduciary duty and breach of contract."

He said the lawsuit "had nothing to do with the sale."