Shelly Sterling, wife of Donald Sterling and co-owner of the Los Angeles Clippers, had reportedly set a Wednesday 5 p.m. deadline for people to bid on the team. Donald Sterling has been banned from operating the team and fined $2.5 million for making racist comments on an audiotape.
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Ballmer, who retired from Microsoft four months ago, has a net worth of $20 billion.
NBA owners are voting on June 3 to force Sterling and his wife Rochelle to sell the team.