TomljanoviÄ‡ has won four singles and three doubles titles on the ITF tour in her career. On 23 February 2015, she reached her best singles ranking of world No. 47. On 5 January 2015, she peaked at world No. 47 in the doubles rankings.
TomljanoviÄ‡ was an accomplished junior player, having won the 2009 Australian Open Girls' Doubles title with Christina McHale. She would also reach her combined career high junior ranking of world number 4 on 30 March 2009.
In July 2014, it was announced that TomljanoviÄ‡ would take Australian citizenship and begin competing for Australia at the 2014 US Open. She will continue to represent Croatia at all non-Grand Slam events until she receives an Australian passport, which will enable her to represent the country at Grand Slam and non-Grand Slam tournaments alike. On 29 January 2018, TomljanoviÄ‡ was listed in the official WTA rankings as an Australian after receiving her citizenship earlier in the month, meaning she is now able to represent Australia at all events.
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