At the 2007 US Open, she won her first Grand Slam main-draw match against Yaroslava Shvedova, before losing to defending champion Maria Sharapova in the second round.

Dellacqua began the year by reaching the fourth round of the Australian Open and upset 15th-seeded Patty Schnyder, and former champion and world No.

The pair lost in three sets to Spaniards Anabel Medina Garrigues and Virginia Ruano Pascual in a match that lasted two-and-a-half hours.

[8] She found better success in the doubles event, partnering with Francesca Schiavone with whom she reached the finals at last year's French Open.

After representing Australia at the Federation Cup with Samantha Stosur, Alicia Molik and Rennae Stubbs, Dellacqua entered a $25k tournament in Mildura, which she won in both singles and doubles (with compatriot Jessica Moore).

After failing to qualify in the Rome Masters, and Dellacqua and Stubbs unable to pack up their good doubles form from Madrid, her next tournament was the 2011 Brussels Open.

They had a great tournament and caused a major upset, winning the championship by defeating defending champions Katarina Srebotnik and Nenad Zimonjić in a super tiebreak, despite being unseeded.

Dellacqua had a better year in 2012, she played in the main draw of every Grand Slam event, consistently represented Australia in Fed Cup, went to the Olympics and reached her first WTA semifinal.

The Western Australian tweeted that it was tennis great Roger Federer who inspired her throughout her time in Fukuoka, the reason she altered her racquet string configuration during the week.

She was only entered in the women's doubles alongside Samantha Stosur, they lost to the eighth seeds Nuria Llagostera Vives and María José Martínez Sánchez in the first round.

However, she removed from the wildcard list after one of several players withdrew and was promoted to the last entry in the main draw as the fifth and final alternate in the tournament.

With her singles ranking being well inside the top 100, it meant for the first time since 2008 Dellacqua would not have to play the Australian Open wildcard playoff.

Dellacqua was given a tricky draw at the Australian Open where she had to play young American Madison Keys who was bringing form and confidence into the match.

Breezing through to the quarterfinals, along the way defeating Cîrstea & Wickmayer, Cetkovská & Flipkens and ninth seeds Huber & Llagostera Vives.

As the top seed, she went on to win the tournament, defeating Maddison Inglis, Monique Adamczak, Tammi Patterson & Arina Rodionova along the way.

Delacqua remained on Australian soil, to participate in Australia's 2014 Fed Cup World Group tie against Russia in Hobart.

Dellacqua and Ashleigh Barty closed the tie by winning their doubles match in straight sets, which secured Australia a 4–0 victory over the Russians.

[27] She also reached the quarterfinals of the doubles event with Barty but the pair lost in straight sets to the top seeds, Hsieh Su-wei and Peng Shuai.

Dellacqua chose not to compete in the Madrid Open and instead began her clay court season at the Internazionali BNL d'Italia in Rome.

[32] Dellacqua also reached the quarterfinals of the doubles event with Klaudia Jans-Ignacik, defeating Katarzyna Piter/Chanelle Scheepers and Monica Niculescu/Zhang Shuai en route before losing in straight sets to Medina Garrigues and Shvedova.

[34] However, Dellacqua won the doubles event with Barty defeating Tatiana Búa and Daniela Seguel in the final in three sets, coming back from 6–4, 5–1 and three championship points down.

Dellacqua defeated Urszula Radwańska[38] and Varvara Lepchenko[39] in straight sets to reach the third round where she upset her second-seeded compatriot and former US Open champion Samantha Stosur in three sets[40] to reach the quarterfinals where she defeated Kimiko Date-Krumm in a match lasting just 48 minutes[41] before losing in the semifinals to eventual runner-up, Barbora Záhlavová-Strýcová.

[43] Dellacqua also reached the final of the doubles event, defeating Tímea Babos and Kristina Mladenovic; Liezel Huber and Lisa Raymond and Caroline Garcia and Zhang Shuai en route before losing to the third seeds, Raquel Kops-Jones and Abigail Spears in straight sets.

At the Wimbledon Championships, Dellacqua defeated qualifier Anett Kontaveit in three sets after having been match point down[44] before falling to 4th seed Agnieszka Radwańska in the second round.

She continued her good form by reaching the quarterfinals of the Pan Pacific Open defeating an in-form Sabine Lisicki and Marina Erakovic in the first and second round respectively, before falling to Garbiñe Muguruza despite being up a set.

Dellacqua commenced the season at the Hopman Cup, losing all three rubbers to Agnieszka Radwańska, Alizé Cornet and Heather Watson.

She then caused a big upset over 17th seed and recent French Open quarterfinalist Elina Svitolina to reach the third round and equal her best Wimbledon performance.

Dellacqua began her summer hardcourt season participating the qualifying event at the Rogers Cup, but fail to get to the main round.

Once again, they finished runner-up, this time to top-seeded pair Mirza/Hingis, which means Dellacqua's Grand Slam final record in women's doubles event fell to 0–6.

In February, Dellacqua travelled to Bratislava to play Fed Cup and partnered Samantha Stosur to win the deciding rubber against Slovakia.