2008–12 Molnar made her debut in July 2008 at the $25k event in
Waterloo, reaching the second round in singles and the quarterfinals in doubles. Molnar decided to go to College instead of turning professional in 2009 and was a four-time All-Big Ten performer for the
Iowa Hawkeyes until 2012. She was also named Big Ten Freshman of the Year in 2009 and finished her career with 100 singles victories for only 32 losses, the third highest total in program history. She also amassed a 69–44 record in doubles. In August 2012, Molnar was awarded a wildcard to play qualifying at the WTA tournament in
Montreal, but lost to
Mirjana Lučić-Baroni in the first round.
2013 Molnar won her first professional singles title at the beginning of January at the $10k event in
Fort-de-France with a victory over
Shérazad Reix. In October, Molnar made it to semifinals in doubles of the $25k event in
Tampico. Molnar reached at the end of October the semifinals in doubles of the $50k
Toronto Challenger.
2014–15 In mid-January 2014 at the $10k event in
Saint Martin, Molnar made it to the second professional singles final of her career, but was defeated by
Hsu Ching-wen. At the
Sumter $10k event in May 2014, she reached the second professional doubles final of her career, but lost to Sophie Chang and Andie Daniell. A week later at the $10k event in
Hilton Head, Molnar won her first pro doubles title with a straight-sets win over
Lauren Albanese and
Macall Harkins. At the end of June 2014, Molnar won the second singles title of her career with a victory over Tori Kinard at the $10k event in
Victoria. In September 2014 at the
Coupe Banque Nationale, she was awarded a wildcard in doubles which was her first
WTA Tour main draw. She lost in the quarterfinals to
Barbora Krejčíková and
Tatjana Maria. In late October 2014, Molnar reached her biggest doubles final to date at the $50k
Saguenay Challenger where she was eliminated by
Ysaline Bonaventure and
Nicola Slater. In late January 2015, Molnar reached the doubles final of the $10k event in Saint Martin but lost in straight sets to
Alexa Guarachi and Ayaka Okuno. In June 2015, she won her third pro singles title after defeating Alexa Graham at the $10k event in
Bethany Beach. She played her last match in August 2015 at the
Challenger de Gatineau ==ITF Circuit finals==