A federal judge rejected Sterling's motion.
In the afternoon, Sterling was called to the witness stand in Los Angeles County Superior Court but he wasn't there, prompting yet another delay.
Sterling's estranged wife, Shelly, has struck a deal to sell the team to former Microsoft CEO Steve Ballmer after her husband's racist remarks to a girlfriend were publicized and the NBA moved to oust him as team owner.
The non-jury trial will determine whether Shelly Sterling had authority under terms of a family trust to unilaterally negotiate the deal.
She had two doctors examine her 80-year-old husband and they declared him mentally incapacitated and unable to act as an administrator of the Sterling Family Trust, which owns the Clippers.
The court must find that Sterling's wife acted in accordance with the trust and that the deal still applies — even though the trust has since been revoked by Donald Sterling — for the sale to proceed.
In seeking a move to federal court last week, Sterling's attorneys argued that their client was induced to undergo mental examination under false pretenses and that his private, personal medical records were given to his wife's "handpicked" doctors in violation of federal medical privacy laws.
His wife's lawyers claim Donald Sterling's legal maneuvers were just a tactic to run out the clock on the Clippers sale.
NBA owners are scheduled to vote on the deal on July 15. It's also the day that Ballmer's offer is set to expire — and there is no deal without the judge's approval of the sale.
If the sale isn't completed by Sept. 15, the league said it could seize the team and put it up for auction.
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