Rebecca Marino

Marino played the first professional event of her career at the 25k Vancouver Open in August 2005, losing in qualifying. In August 2006, she lost in the qualifying first round of the Rogers Cup as a wildcard. Marino won in August 2008 her first singles title at Trecastagni and two in doubles, respectively, in Evansville, Indiana in July and in Southlake, Texas in October of the same year. In November 2008, she won her first WTA Tour main-draw match at the Challenge Bell as a qualifier, defeating Jill Craybas in the first round. She was defeated by Galina Voskoboeva in the second round. In September 2009 at the Challenge Bell, Marino reached the second round for the second straight year with a win over Lauren Albanese, but lost her next match to Julia Görges.

Marino played the first major of her career at the US Open in August. After winning three qualifying matches to enter the main draw, she beat Ksenia Pervak to set up a second round clash with world No. 4, Venus Williams. She lost after a close first set which ended in a tiebreak. After the match, Venus said: "It seemed like every time I had an opening she came up with a big serve, so I guess I know what it is like now playing myself." Her next tournament was in Quebec City at the Challenge Bell where she beat fellow Canadian Heidi El Tabakh in the first round. Marino upset top-seeded and world No. 14, Marion Bartoli, in straight sets in the second round, which was her first career win against a top-20 player. She lost her quarterfinal match against Bethanie Mattek-Sands. Staying in the province of Québec, she played at the 50k Saguenay Challenger the following week. Marino made it to the final and defeated Alison Riske in three tough sets to win the tournament, the second singles title of her career. She won her second straight 50k event two weeks later in Kansas City by defeating Edina Gallovits in the final. Marino won her third straight 50k in Troy where she defeated Ashley Weinhold. In November, she lost in the semifinals of the 50k Toronto Challenger against Alizé Lim, who stopped her winning streak at 18.

At the Australian Open in January, Marino defeated Junri Namigata in the first round. She lost in the second round against sixth seed Francesca Schiavone with a score of 7–9 in the final set. In February, Marino reached her first WTA final at the event in Memphis, where she faced Magdaléna Rybáriková. She was forced to retire from the match after losing the first set because of an abdominal strain. Marino qualified for the Indian Wells Open in March, but lost in the first round to Ekaterina Makarova. Following her first round exit, Marino took part in the inaugural $100k Bahamas Women's Open. As the fourth seed, she defeated qualifier Sophie Ferguson in the first round, Pauline Parmentier, and another qualifier, Heather Watson to reach the semifinals, where she lost against fifth seeded Angelique Kerber. At the French Open in May, she won her first round match over Kateryna Bondarenko and her second round match against María José Martínez Sánchez. She lost against 13th seed Svetlana Kuznetsova in the third round, her best Grand Slam performance so far. The following month, she reached the second round for her fourth straight major at Wimbledon where she lost to Roberta Vinci. At the US Open in August, Marino lost for the first time in the first round of a major to Gisela Dulko. In September, she reached the quarterfinals of the Challenge Bell for the second straight year, after beating fellow Canadians Stéphanie Dubois and Aleksandra Wozniak in the first and second round, respectively, but lost to Michaëlla Krajicek. At the last tournament of her season, the Luxembourg Open in October, she surprised the second seed and No. 15 player in the world Anastasia Pavlyuchenkova in the first round which was the second win in her career over a top-20 player. She lost her second-round match against qualifier Bibiane Schoofs.

In January 2012, Marino lost in the first round of the Australian Open to Gréta Arn. She took a break from tennis to deal with mental and physical fatigue from February 2012 to late August 2012. Marino made a comeback the second week of September 2012 at the 25k in Redding, California, losing in the second round to Sachie Ishizu. The next month, in only her fifth tournament since coming back, she defeated fellow Canadian Sharon Fichman to win the 25k in Rock Hill, South Carolina as a qualifier. She then lost a week later in the first round of the 50k Saguenay Challenger to Maria Sanchez, stopping her winning streak at eight matches. In November 2012, at the 50k Toronto Challenger, Marino was forced to retire in her second round match, after suffering an abdominal strain. She was supposed to end her season the next week at the 75k event in Phoenix, but had to withdraw following her injury.

At the Australian Open in January 2013, her first Grand Slam championship since coming back, Marino made it to the main draw with her protected ranking of 115, but lost to Peng Shuai in the opening round. After playing some ITF and WTA tournaments, she decided in late February 2013 to take a second break from tennis with no timetable for her return.

Marino started training again during the first week of September 2017 and decided to return to competition in October 2017, after being away from the game for nearly five years. She was scheduled to play the 60k Saguenay Challenger but her comeback was delayed by three months due to ITF administrative regulations. She returned at a 15k event in Antalya at the end of January 2018 and won the title in her first tournament back, not losing a set along the way. The next week, she won her second straight title at a 15k in Antalya, without losing a set once again. Again in Antalya the week after, she captured her third $15k event in a row. Playing her fourth straight tournament in Antalya, the first on clay, Marino lost her quarterfinal match, ending her winning-streak at 19 matches. At her next tournament in March, a 25k tournament in Kōfu, she reached the quarterfinals as a qualifier but was defeated by world No. 101, Luksika Kumkhum, in three sets. In April at the 25k in Osaka, she advanced to her fourth final of the season where she lost to Destanee Aiava.

Marino began the season using a protected ranking to gain entry into the qualifying tournament for the Australian Open, held in Dubai mid-January. She qualified for her first Grand Slam tournament in ten years, defeating Jaqueline Cristian, Viktoriya Tomova and Maryna Zanevska without dropping a set. She was granted direct entry into the Gippsland Trophy, one of three makeshift WTA Tour lead-up tournaments created for the participants of the upcoming Australian Open, also held in Melbourne, but lost in the first round to Jasmine Paolini.

Marino won her first round match at the Australian Open defeating Kimberly Birrell, before losing her next match to Markéta Vondroušová. At the Phillip Island Trophy, she defeated Mona Barthel, before losing in the second round to fourth seed Petra Martić.

In July she won the 25k event in Evansville, Indiana, overcoming Mayo Hibi in the final.

Partnering Liang En-shuo, Marino won her first WTA 125 doubles title at the LTP Women's Open, defeating to Erin Routliffe and Aldila Sutjiadi in the final which went to a deciding champions tiebreak.

At the US Open, she reached the third round for the first time at this major, and only a second time at this level, defeating Magdalena Fręch and Daria Snigur, before losing to Zhang Shuai.

Ranked No. 182, Marino qualified for the Australian Open main draw, making her seventh appearance at this major. She lost in the first round to fifth seed Jessica Pegula.

In February, entering as the sixth seed, Marino won the title at the W100 Guanajuato Open. Losing only one set in the tournament, she upset fourth seed Jule Niemeier in straight sets in the final.

Marino qualified for the WTA 250 Nottingham Open in June, defeating Viktorija Golubic in the first round, before losing her next match to third seed and eventual champion Katie Boulter. The following week she won her first grass-court title at the W100 Ilkley Trophy, defeating Jessika Ponchet in three sets in the final.

In October, she won her third ITF title of the season at the W75 Calgary Challenger, dropping just one set in the entire tournament to fellow Canadian Cadence Brace in the semifinals, before defeating qualifier Anna Rogers in the final.

Partnering Carmen Corley, Marino won her second WTA 125 doubles title at the Abierto Tampico tournament, defeating Alina Korneeva and Polina Kudermetova in the final.

Playing as the sixth seed, in her final individual tournament of the year, Marino secured the biggest title of her career to date at the Dow Tennis Classic WTA 125 event in Midland, Michigan. After losing just one set all week with wins over qualifier Robin Anderson, Louisa Chirico, Alina Korneeva and eighth seed Lesia Tsurenko, she defeated the third-seeded American Alycia Parks in straight sets in the final.

Marino started her 2025 season at the Auckland Classic, where she defeated fourth seed Lulu Sun in the first round, before losing her next match to Bernarda Pera. She gained direct entry into the Australian Open thanks to her WTA ranking, but was eliminated in the opening round by 22nd seed Katie Boulter.

In June, Marino fell just short of defending her title at the Ilkley Open, losing the final of the newly elevated WTA 125 event to Iva Jovic in straight sets.