Williams Sisters are playing Doubles at Aussie Open

Venus and Serena are playing both singles and doubles at the 2009 Australian Open. Will they repeat last year's Sister Slam (at Wimbledon), taking the doubles and singles trophies? It is possible. They are both playing great tennis. The last time the two of them pulled a "Sister Slam" at the Australian Open was in 2003 (winning the doubles and Serena winning the singles title).