Career
On 24 August 2015, she reached her best singles ranking of world number 33. On 28 September 2015, she peaked at world number 49 in the doubles rankings. At the 2007 French Open, her first Grand Slam tournament, she reached the third round in the singles event, beating 22nd-seeded Alona Bondarenko.
In the third round, she lost to 14th-seeded Patty Schnyder of Switzerland.
At the 2007 United States Open, she defeated Chan Yung-jan to reach the second round where she lost to American wildcard Ahsha Rolle. Knapp reached her first Women's Tennis Association Tour final in 2008 in Antwerp.
She lost there to world northern 1 and home favorite Justine Henin.
At the 2008 French Open, she lost in the third round to top-seeded Maria Sharapova.
Her biggest International Tennis Federation Women"s Circuit final came in 2007 in Biella, where she was beaten by Agnieszka Radwańska. At the 2013 Wimbledon Championships, Knapp reached the fourth round of a Grand Slam event for the first time. One of Knapp"s biggest professional matches came at the 2014 Australian Open, where she lost in a tough second-round encounter with Maria Sharapova.