Kim Clijsters Beats Serena Williams 6-4, 7-5, Scores One of the Biggest Upsets in the US Open, Sept 12, 2009, 10:50am ET, Clijsters-Wozniacki Finals

12 September 2009, 10:50am Eastern Time

Kim Clijsters is definitely back!

Clijsters was about to break Serena in the last game of the match when Serena suddenly had an argument with a female line umpire over a foot fault called against her.  That incident earned for Serena a point penalty which happened to be the match point, the final point, thus allowing Clijsters to beat the American ace 6-4, 7-5 to move to the finals of the US Open.

Serena Williams approached the female line umpire, 

addressing her directly with racket raised

With the score standing at 6-4, 6-5, 40-15 in favor of Kim 

Clijsters, Serena Williams discusses the foot fault call with 

tournament officials as the female line umpire looks on. The 

point penalty deprived Kim Clijsters the chance 

to win the match point with her racket.

Only one woman now stands in the way of Kim Clijsters' winning the US Open 2009, the winner of the Yanina Wickmayer - Caroline Wozniacki match now playing. 

That match has just ended with the 19-year-old Wozniacki winning 6-3, 6-3.

It will be a Clijsters-Wozniacki showdown for the women's championship of the US Open 2009.