She advanced to the fourth round before losing to World No. 1 Serena Williams in straight sets .
Pe'er was seeded 18th leading into the 2010 French Open , the second Grand Slam of the year .
Pe'er advanced to the fourth round before losing to World No. 1 Serena Williams in straight sets .
Pe'er was seeded 18th leading into the 2010 French Open , the second Grand Slam of the year .