Serena injured, Henin advances in Madrid (AP) Serena Williams retired with a left knee injury after one set Wednesday and defending champion Justine Henin advanced to the semifinals at the Sony Ericsson Championships. Ana Ivanovic moved closer to the final four by knocking out Daniela Hantuchova with a 6-2, 7-6 (9) win in red group play. Williams was treated by the tournament doctor before the start of the ninth game. Publish Date: Wed, 07 Nov 2007 15:37:50 PST Read more...