A judge in Washington, US, delayed the trial's start until Wednesday while lawyers work out issues over evidence from Brown's bodyguard.
Bodyguard Chris Hollosy was convicted of assault today. Brown's lawyers want Hollosy to give evidence on Brown's behalf, but Hollosy plans to appeal.
Both men were arrested in October after a man accused them of punching him outside a Washington hotel.
Hollosy told police that he punched the man after he tried to get on Brown's tour bus. But the man told police a different story.
He said Brown and later Hollosy punched him after he tried to get in a photo Brown was taking with two women.
Court papers say the man's nose was fractured.