In the US Open semifinal round against Kim Clijsters, Williams slammed her racket on the court after losing the first set. She was given a warning, with a potential second violation carrying a one-point penalty. While trailing 4–6, 5–6, 15–30, Williams's second serve was called a foot fault, resulting in two match points for Clijsters. Williams gestured with her racket to the lineswoman who had made the call and yelled at her, with profanities and a threat to shove a tennis ball down the lineswoman's throat. During the subsequent on-court conference between the chair umpire, the lineswoman, US Open officials, and Williams, a television microphone picked up Williams saying to the lineswoman, "I didn't say I would kill you! Are you serious?" The incident resulted in Williams being penalized a point for unsportsmanlike conduct—necessitated by the earlier warning for racket abuse—meaning Clijsters won the match 6–4, 7–5. The following day, Williams was issued the maximum permissible on-site fine of $10,000 (plus $500 for racket abuse). After further investigation, the Grand Slam Committee in November 2009 fined her $175,000 in place of suspending her from the 2010 US Open or other Grand Slam events. They also placed her on a two-year probation which provided that if Williams committed another offense at a Grand Slam event in the next two years, she would be suspended from participating in the following US Open. If, however, she committed no offenses within the next two years, her fine would be reduced to $82,500. Williams initially refused to apologize for her outburst, both in her post-match press conference and in an official statement released the following day. She eventually did apologize, stating "I just really wanted to apologize sincerely because I'm a very prideful person, and I'm a very intense person and a very emotional person", and "I wanted to offer my sincere apologies to anyone that I may have offended." She said she was humbled by the experience.
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