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Serena Williams is the best women's tennis player in the world.
This elite tournament in Doha, Qatar matches up the top eight players in the world. Little Sis entered this $4.5 million season ending WTA Championships event trailing Safina by 155 ratings points.
The players are divided into two groups, the Maroon and White ones, with the top two from each group advancing to the semifinals after playing a round robin schedule. In addition, each victory in this tournament is worth 230 points.
After Serena dispatched Svetlana Kuznetsova in her opening Maroon Group match 7-6, 7-5, Safina entered her White Group match against Jelena Jankovic trailing by 75 points. After stepping onto the court and earning 70 ranking points for doing so, Safina was forced to retire two games into the mach due to a back injury.
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Even if Serena doesn't win any more matches, she will finish the year ranked Number one. Then she and Big Sis will get a well deserved break until January 18-31, 2010.
What are those dates, you ask? The scheduled dates for the first Grand Slam event of the 2010 tennis season, the Australian Open.