Julia Cohen started hitting tennis balls when she was just 2 years old, emulating her older brother Josh. She started playing in sanctioned USTA tournaments when she was 5, and at 6 she was winning many of them and was ranked No. 1 in the 18-and-under girls doubles in the United States Tennis Association Middle States.
Cohen was the national champion in both the 9 and 10 and under divisions at the Little Mo 9 Nationals beating Alexa Glatch in the finals 6-0, 6-0. At the age of 11 she was the top-ranked 12-and-under singles player in the U.S., winning all of the National Championships on every surface. During her junior career, Julia was ranked #1 in the United States in every age category, winning 12 Gold Balls in national competition. Additionally, Julia was chosen to be member of the United States International Junior Fed CupTeam.
Julia was an accomplished and successful international junior player, reaching a combined career-high of No. 4 in the International Tennis Federation (ITF) junior world rankings on June 11, 2007. She competed in 12 Junior Grand Slam events, highlighted by her showing at the 2007 Australian Open Junior Championships where she reached the doubles final with Poland's Urszula Radwanska. Julia won the the Grade A Cassablanca Cup in Mexico a record three times, overcoming players Caroline Wozniacki and Dominica Cibulkova.
In her first year competing at the college level, Cohen was named SEC Rookie of the Year and Intercollegiate Tennis Association (ITA) Rookie of the Year while playing with the University of Florida Gators. She was the first Florida rookie to open dual match play at No. 1 singles in nearly 15 seasons and compiled a perfect 21-0 record in doubles play with the Gators. Cohen transferred to the University of Miami Hurricanes and finished the year ranked fifth in the nation in singles after advancing to the semifinals of the NCAA Singles Championships. She posted a 33-8 record in singles and received All-ACC honors following a perfect 11-0 record in ACC league play.
Julia has been a member of both the Philadelphia Freedoms and the Boston Lobsters professional World Team Tennis League, owned by Billie Jean King. On the professional women's tennis circuit, Julia has accumulated four career singles and five doubles titles on the ITF circuit. She has career wins over Carolina Pliskova, Irina Falconi, Kesnia Pervak, Ielzaveta Rybakova, Madison Brengle, Coco Vandeweghe, and numerous other named players. In 2012, Julia was the finalist in the prestigious WTA Baku Cup. That same year, Julia reached number 121 in the WTA Doubles Rankings and reached her best WTA Singles Ranking at #97 in the world.