sentences:  The two-time defending champions in 2005 and 2006, Lisa Raymond and Samantha Stosur are unable to compete in this year's Championships, due to a viral illness from which Stosur is recuperating.In 2007, the American-Australian duo won four Tier-I tournaments in Tokyo, Indian Wells, Key Biscayne, Berlin, and also the tournament in Eastbourne.Chan Yung-jan and Chuang Chia-jung, from Taiwan, have become the second team to qualify for Madrid, officials announced on October 22.