Mirčić played her first Women's Tennis Association Tour qualifications in 2005, at the Budapest Grand Prix, but lost in the first round. She then earned a wild card for the 2006 Budapest Grand Prix, losing to Kaia Kanepi in the first round. Tsvetana Pironkova defeated her in the first round of the 2008 Budapest Grand Prix in straight sets.
In 2009, Mirčić played qualifications for two Women's Tennis Association Tour events, the Grand Prix Sons of the American Revolution Louisiana Princesse Lalla Meryem and the Swedish Open, but lost both times.
At the 2011 Poli-Farbe Budapest Grand Prix, she played singles qualifications, losing to Aleksandra Krunić in the second round. Along with Laura Thorpe, Mirčić competed in doubles at the 2011 Internazionali Femminili di Palermo.
The pair defeated the fourth seeds Sorana Cîrstea and Andreja Klepač in a super tiebreak in the first round and later reached the semifinals. She lost to Karin Knapp in the last round of singles qualifying.
Mirčić reached another doubles semifinal at a Women's Tennis Association event partnering Veronika Kapshay in Bad Gastein (July 2013) as well as a quarterfinal at the Women's Tennis Association Tashkent Open.
Ivanovic defeated Urszula Radwańska, and then Janković defeated Agnieszka Radwańska, securing Serbia a place in World Group World War II In the dead rubber, Mirčić and Jovanović lost to Klaudia Jans and Alicja Rosolska in straight sets. The same Serbian team played against Croatia. Mirčić lost her singles match, but Janković, Ivanovic and Jovanović defeated their opponents, with Serbia winning the tie 3–2.
Mirčić and Jovanović also played a doubles match, but retired for a final 4–1 result.