In 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.

In October of the same year she received a wildcard to appear at her first WTA tournament in Linz; she defeated Elena Vesnina in the first round and lost to Ana Ivanovic after a tough first set.

In 2006, she passed qualifying in Istanbul, where she lost in the second round to Catalina Castaño; and in Portorož at the Slovenia Open, where she won her first WTA Tour title by defeating No.

Paszek started at the Australian Open, where she qualified for the main draw and defeated top-40 player Séverine Brémond in straight sets in the first round, before losing to No.

At Paszek's first grass tournament of her career, she reached the third round in Birmingham, losing to Maria Sharapova in a tight match.

At the US Open, Paszek defeated the 23rd seed Maria Kirilenko, only then to lose to the lower ranked opponent Magdaléna Rybáriková.

Paszek began 2010 season at the Auckland Open where she retired during her second round of qualifying match against Rebecca Marino.

Paszek defeated Tadeja Majerič and then crushed top seed Anastasia Rodionova but then lost to Liana Ungur.

At the Slovenia Open, she defeated Jelena Kostanić Tošić for her first main-draw win since Ponte Vedra Beach in 2009.

In the final qualifying round, Paszek trailed Rodina 2–6 after the first set, before coming back to win the second and blank the Russian in the third.

She then crushed Christina McHale in the semifinal to book her place in the final, where she won the title by beating Bethanie Mattek-Sands.

Paszek began the 2011 season at the Auckland Open where she lost in the first round to eighth seed Sofia Arvidsson.

[6] At the Hobart International, Paszek qualified for the main draw defeating Darya Kustova, Stéphanie Dubois, and sixth seed Kateryna Bondarenko.

In February, Paszek played at the Pattaya Open in Thailand, and was defeated in the first round by top seed and two-time defending champion Vera Zvonareva.

[10] Paszek qualified for the Porsche Tennis Grand Prix beating Sesil Karatantcheva, Lenka Juríková, and Zuzana Kučová.

[11] In Portugal at the Estoril Open, Paszek qualified for the tournament defeating Ekaterina Ivanova, Laura Siegemund, and Heather Watson.

[12] Paszek played at the Italian Open where she qualified for the tournament beating Casey Dellacqua and Virginie Razzano.

In the Birmingham Classic, Paszek reached the third round after wins over Sania Mirza and sixth seed Ekaterina Makarova.

[16] Ranked 80 at the Wimbledon Championships, she reached the quarterfinals for the first time in her career after victories over Ayumi Morita, Christina McHale, sixth seed Francesca Schiavone, and Ksenia Pervak.

[18] At the Carlsbad Open, Paszek retired during her third-round match against Sloane Stephens due to a left abdominal injury.

In Beijing at the China Open, Paszek upset tenth seed Jelena Janković in their first-round match.

[51] In the Korea Open, she reached the quarterfinals after wins over Carla Suárez Navarro and Korean wildcard Lee So-ra.

Seeded 13th, she retired in the first round after losing the first set 3–6 to American qualifier Grace Min due to a left neck injury.

[72] Paszek entered the Eastbourne International as the defending champion, but again went out at the first hurdle, losing to fifth seed Caroline Wozniacki; she had to retire in the second set due to a thigh injury.

There, she recorded her third win of the season when her opponent, qualifier Alla Kudryavtseva, retired during their first-round match due to heat illness.

For the last Grand Slam tournament of the year, the US Open, Paszek was defeated in the second round of qualifying by Andrea Hlaváčková.

Unseeded, Paszek advanced to the final with wins over Johanna Konta, Andreea Mitu, Nina Zander, and Sílvia Soler Espinosa.

Playing in England the GB Pro-Series, Paszek won a tough three-set match over Andreea Mitu in the first round.

At the 2014 Open de Cagnes-sur-Mer, Paszek lost in her quarterfinal match to fifth seed and eventual champion Sharon Fichman.

Playing at the first edition of the Bucharest Open, Paszek retired during her second round of qualifying match against Vanda Lukács.