For your information, the two year probation expired before this year's US Open began....
The fine is about right, given how silly the code violation was.
BBC Sport - US Open 2011: Serena Williams fined $2,000 for umpire rant
'"The Grand Slam committee director has determined that Ms Williams' conduct, while verbally abusive, does not rise to the level of a major offence under the Grand Slam code of conduct," said a USTA statement.'
The BBC news report sounded so disappointed that Serena didn't get more....
How unknowledgeable can they be? This is not a serious offence by any stretch of the imagination. This is consistent with the punishments meted out to other players over recent years.
You cannot have a small fine for white players, and a major fine (or ban) for black players. They have to be consistent for all players....