2005–2008 Bengson played collegiate D1 tennis at Long Beach State. She was the Big West Conference Freshman of the Year in 2005 and first team All-Big West honoree three times. A member of four League Championship and NCAA post-season teams, Bengson earned a collegiate career-high No. 31 in doubles and No. 115 national ranking. She was a key part of the 2008 team that achieved Long Beach's highest ever team ranking at No. 18 in the ITA rankings.
2011 Bengson won three doubles titles on tournaments of the
ITF Women's Circuit in 2011.
2012 Bengson started her year playing at the Premier-level tournament in
Sydney. She and
Tyra Calderwood fell in the first round to
Maria Kirilenko and
Nadia Petrova. She and Calderwood then received a wildcard into the
Australian Open, but they also fell in the first round to
Eva Birnerová and
Alberta Brianti. This was Stephanie's first Grand Slam performance. In May, Bengson went back to the ITF Circuit, competing in a string of Japanese Challengers. She won her biggest title yet at the $50k-level tournament in
Fukuoka in May, winning the doubles event with fellow Australian,
Monique Adamczak. She then went to compete in the WTA International event, a week before
Roland Garros in
Strasbourg. She played alongside Adamczak in the doubles event and reached her first ever WTA Tour quarterfinal. The pair defeated Slovak duo
Lenka Juríková and
Kristína Kučová in the first round, and fell in the quarterfinals to
Alexandra Cadanțu and
Anne Keothavong.
Before the tour Bengson played from 2005 to 2008 at nationally ranked Long Beach State. She was twice named first team all conference in both singles and doubles while earning career-high national rankings of No. 31 in doubles and 115 in singles during her senior season. Her team won the Big West Conference title and advanced to the NCAA's all four seasons she played at Long Beach State, including a No. 18 team-ranking during 2006. She graduated in 2008. ==ITF Circuit finals==