Serena Williams was fined a record $82,500 on Monday for her U.S. Open outburst, and could be facing a suspension from the tournament if she flips out at any Grand Slam in the next two years.

So what did she do? The 11-time Grand Slam singles champ went nuts on a lineswoman after a foot-fault call (a call rarely made at the end of such an important match) during her semi-final loss to Kim Clijsters at the U.S. Open in September. The call resulted in a double-fault for Williams, moving Clijsters one point from victory. Serena stopped, grabbed a ball to serve again and then paused. She moved toward the official and started hollering, cussing and shaking the ball at her. She was penalized a point on the spot – during match point –  to end the semifinal with Clijsters ahead 6-4, 7-5.

Grand Slam head honcho Bill Babcock said Williams is on a “probationary period” at tennis’ four major championships until 2011. If at any of these tournaments she has another “major offense” he will increase the fine to $175,000 and then ban her from the following U.S. Open.

The previous highest fine given to a player after an uncalled-for tirade was for roughly $48,000 to Jeff Tarango back in the 1990s. Behave yourself, Serena!