Serena Williams survives longest match of her career to reach third round of Madrid Open . World No . 1 and unseeded Russian Vera Dushevina 6 - 7 ( 6 - 7 ) 7 - 6 ( 7 - 5 ) 7 - 6 ( 7 - 5 ) American will next play either 16th seed Nadia Petrova or Anastasia Pavlyuchenkova . Eighth seed Samantha Stosur wins to set up clash with Maria Jose Martínez Sanchez .
Serena Williams survives longest match of her career to reach third round of Madrid Open . World No . 1 beats unseeded Russian Vera Dushevina 6-7 ( 2-7 ) 7-6 ( 7-5 ) 7-6 ( 7-5 ) American will next play either 16th seed Nadia Petrova or Anastasia Pavlyuchenkova . Eighth seed Samantha Stosur wins to set up clash with Maria Jose Martinez Sanchez .