Golden State Warriors owner Chris Cohan, whose long-suffering team finally has become a force on the basketball court, has been waging his own battle in federal court over claims he evaded taxes and owes the government more than $160 million.

The government says Cohan, a former cable TV mogul, "engaged in three potentially abusive tax shelters" when he sold Sonic Communications in 1998 for more than $200 million, court records show.

An attorney for Cohan was at the Phillip Burton Federal Building in San Francisco on Wednesday -- the day after the Warriors' unexpected playoff run ended -- arguing that his client should not have to turn over certain documents the government has pursued in its investigation of the tax shelters and their creators.