Paszek has won three singles titles on the WTA Tour, as well as three singles and three doubles titles on the ITF Women's Circuit. Her greatest success so far: she reached the quarterfinals of a Grand Slam tournament twice, 2011 and 2012 at the Wimbledon Championships. On 11 February 2013, she reached her best singles ranking of world No. 26. On 6 May 2013, she peaked at No. 93 in the doubles rankings. Over her career, Paszek has defeated top ten players Marion Bartoli, Elena Dementieva, Daniela Hantuchová, Ana Ivanovic, Jelena Janković, Angelique Kerber, Flavia Pennetta, Francesca Schiavone, Patty Schnyder, and Caroline Wozniacki.