US Open 2009 SORE SERENA

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US Open 2009 SORE SERENA

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NEW YORK (AP) - Serena Williams was fined $10,000 Sunday for a profanity-laced tirade directed at a U.S. Open line judge, and an investigation is under way to determine whether there should be additional punishment.

The $10,000 penalty — not quite 3 percent of the $350,000 in prize money Williams earned by reaching the semifinals at Flushing Meadows — is the maximum on-site fine that can be issued for unsportsmanlike conduct at a Grand Slam tournament.

The U.S. Open said in a statement that the Grand Slam Committee Administrator will "determine if the behavior of Ms. Williams warrants consideration as a major offense for which additional penalties can be imposed."

Serena's big meltdown Photos: It was a wild night at the U.S. Open. Check out these shots of Serena Williams' loud exit at Arthur Ashe Stadium. 

Williams, who was the defending champion, also was docked $500 for smashing her racket after the first set of what became a 6-4, 7-5 loss to Kim Clijsters on Saturday night.

Two points from losing in the second set, Williams faulted at 5-6, 15-30. On her second serve there, the line judge called a foot fault, making it 15-40 and giving Clijsters a match point. Williams began berating the line judge and a penalty point was awarded to Clijsters; because it happened to come on match point, it ended the semifinal.

"Last night, everyone could truly see the passion I have for my job. Now that I have had time to gain my composure, I can see that while I don't agree with the unfair line call, in the heat of battle I let my passion and emotion get the better of me and as a result handled the situation poorly," Williams said in a statement released Sunday by a public relations firm.

"I would like to thank my fans and supporters for understanding that I am human and I look forward to continuing the journey, both professionally and personally, with you all as I move forward and grow from this experience."

The chairman and CEO of the women's tennis tour, Stacey Allaster, issued a statement calling Williams' conduct Saturday "inappropriate and unprofessional."

"No matter what the circumstances, no player should be allowed to engage in such behavior without suffering consequences. I have spoken with the USTA about this matter and I agree with the action they have taken," Allaster said.

Williams and her older sister Venus are scheduled to play in the women's doubles final Monday. Venus got in some work on a U.S. Open practice court Sunday; Serena wasn't with her.

Tournament spokesman Chris Widmaier said Sunday that officials were watching tapes of what happened Saturday night. The tournament referee, Brian Earley, interviewed Williams and the match's chair umpire before they left the grounds Saturday.

With Williams serving, two points from defeat, a line judge called a foot fault on a second serve. That gave Clijsters a match point. Williams screamed, cursed and shook a ball in the official's direction, saying "If I could, I would take this ... ball and shove it down your ... throat."

The line judge went over to the chair umpire, and Earley joined in the conversation. With the crowd booing — making part of the dialogue inaudible — Williams then went over and said to the line judge: ", but there are a lot of people who've said way worse." Then the line judge said something to the chair umpire, and Williams responded, "I didn't say I would kill you. Are you serious? I didn't say that." The line judge replied by shaking her head and saying, "Yes."

Williams already had been given a code violation warning when she broke her racket after losing the first set. So the chair umpire now awarded a penalty point to Clijsters, ending the match and giving Clijsters the victory.

Asked in her postmatch news conference what she said to the line judge, Williams wouldn't say, replying, "What did I say? You didn't hear?"

"I've never been in a fight in my whole life, so I don't know why she would have felt threatened," Williams said with a smile.