Sometimes we forget what a formidable doubles team the Williams sisters make. They are, after all, one of only five women's doubles teams to win a career Grand Slam; ten of their titles include six majors. If all goes well, we will see them at the Australian Open in January, and that adds quite an ingredient to the doubles mix.
If all goes well. Given the Williams sisters' problems with injuries (and now Venus's problem with dizziness), it is hard to count on their both being healthy. Serena's knee is especially troubling, since it has been bothering her since 2003.