French Open: Serena Williams exits with injured Achilles heel; Wawrinka beats Dominik Koepfer

In French Open Tennis, an injured Achilles heel cut short Serena Williams' latest bid for a 24th Grand Slam title before her second-round match on Wednesday.   Williams hurt herself during her semifinal loss at the US Open three weeks ago and said she hasn't had enough time to properly heal.   The sudden announcement came roughly an hour before the 39-year-old American was supposed to head out onto Court Philippe Chatrier to face Tsvetana Pironkova.   Williams said it is more t...