No one knows for certain whether order will be restored to the WTA Tour after a palpable shake-up in 2008. Maria Sharapova appeared to be top diva in the game after manhandling the field Down Under. But she subsequently went down with a shoulder injury. Soon after, world No. 1 Justine Henin abruptly retired.
When the dust settled, the Williams sisters took control of the season's second half. Venus Williams claimed her fifth Wimbledon title and closed out the year by winning the Sony Ericsson Championships. Sister Serena flourished in Flushing, seizing the U.S. Open crown.
Will it be sibling supremacy again? Our experts give it their best shot.