2017–18: WTA Tour doubles debut McNally made her
WTA Tour main-draw debut at the
2017 Western & Southern Open in the doubles tournament, partnering with
Alexa Glatch. Later that month, she reached the third round of the
Indian Wells Challenger, losing to eventual winner
Viktorija Golubic. A week after that, she qualified for the
Indian Wells Open, also in Indian Wells, beating
Kristýna Plíšková and
Timea Bacsinszky in the qualifiers. Meanwhile, she and Gauff won the
doubles competition, beating third seeds
Miyu Kato and
Anna Kalinskaya in the semifinal, She was awarded a wildcard into her home tournament, the
Cincinnati Open, She teamed with up
Alison Riske to play in the
doubles. The pair reached the quarterfinals, beating fourth seeds
Xu Yifan and
Gabriela Dabrowski in a second round match that went to 17–15 in the match tiebreak, the second-longest match tiebreak in a women's doubles match. McNally's first win in a major came at the
US Open where she defeated
Timea Bacsinszky in the first round. She took a set off six-times champion
Serena Williams before losing in three sets in a tight second-round match. Passing her in the stadium complex later that night, Williams asked her: "Are you really 17 years old?" McNally and Gauff—dubbed "McCoco"—followed up their 2018 girls' doubles win by reaching the third round of the
doubles event, beating ninth seeds
Nicole Melichar and
Kveta Peschke in the second round in a packed
Louis Armstrong Stadium, but losing heavily to Ash Barty and
Victoria Azarenka in the third. The run took McNally into the top 100 in the
doubles rankings, and just outside the top 100 in the singles rankings. She partnered Gauff again for the
Linz Open, where they reached the semifinal. They were beaten by
Barbara Haas and
Xenia Knoll. At
Luxembourg the following week, McNally lost in the first round to
Jeļena Ostapenko, but went through to the final of the
doubles with Gauff, beating
Misaki Doi and
Makoto Ninomiya, No. 4 seeds
Anna Blinkova and
Miyu Kato, and top-seeded pair of Kristýna Plíšková and
Renata Voráčová. They beat second seeds
Kaitlyn Christian and
Alexa Guarachi in the final to secure their second WTA tournament title, with a career win–loss record of 12–2 as a team.
2020: Major quarterfinal & top 40 in doubles In her first tournament of 2020, the
Auckland Open, McNally was knocked out in the first round of the singles after qualifying as a lucky loser, but she and Gauff reached the semifinals of the
doubles. At the
Australian Open, she won her qualifying matches, entering the main draw, where she defeated
Sam Stosur in the first round, before losing to
Zhang Shuai. In doubles, McNally and Gauff recorded their best result at a Grand Slam tournament, reaching the quarterfinals before falling to second seeded
Kristina Mladenovic and
Tímea Babos in two sets. As a result, McNally broke into the top 40 in the doubles rankings. In March, she lost to
Sachia Vickery in the first round of the
Indian Wells Challenger tournament, but teamed up with
Jessica Pegula to reach the final of the
doubles, beating third seeds Stosur and
Yanina Wickmayer in the semifinal before falling to
Asia Muhammad and
Taylor Townsend in the final. Following the break caused by the
COVID-19 pandemic, McNally took part in the
Western & Southern Open, which was moved from her home town of Cincinnati to New York, losing in the first round to
Alizé Cornet. The following week, she reached the third round of a Grand Slam tournament for the first time when she beat 21st seed
Ekaterina Alexandrova in the second round of the
US Open. McNally made her
World TeamTennis debut in 2020, playing for the
Springfield Lasers.
2021: Major doubles final, doubles top 20 McNally reached her second consecutive doubles quarterfinal at the
Australian Open, again playing with Gauff. They beat sixth seeds
Gabriela Dabrowski and
Bethanie Mattek-Sands, and ninth seeds
Alexa Guarachi and
Desirae Krawczyk, before falling to fourth seeds
Nicole Melichar and
Demi Schuurs. The pair then reached the quarterfinal of the
Miami Open, beating second seeds
Barbora Krejčíková and
Kateřina Siniaková in the round of 16. In April, McNally reached the third round of the
Charleston Open, beating
Elena Rybakina and
Anastasija Sevastova in the first two rounds. In the one-off
MUSC Health Open later that month, also in Charleston, she was beaten in the first round of the singles by
Shelby Rogers, but partnered with
Hailey Baptiste to win the doubles tournament, beating Australian duo
Ellen Perez and
Storm Sanders in the final. She won her second doubles title of the season the following month at the
Emilia-Romagna Open, partnering Gauff, who also won the singles. In August, she lost to
Sloane Stephens in the first round of the
Silicon Valley Classic, but reached the semifinal of the
doubles with
CoCo Vandeweghe. McNally received a wildcard entry to the
US Open, but was beaten in the first round by fourth seed
Karolína Plíšková. In the
women's doubles, McNally and Gauff, who were seeded 11th, made their deepest run yet in a Grand Slam tournament when they reached the semifinals without dropping a set, beating top seeds and current Wimbledon champions Hsieh Su-wei and
Elise Mertens, in straight sets in the quarterfinals. They progressed to the final when their semifinal opponents,
Luisa Stefani and Gabriela Dabrowski, retired after Stefani sustained an injury during the first set tiebreak. In the final, they lost to Sam Stosur and Zhang Shuai. The run to the final lifted McNally to No. 22 in the WTA doubles rankings.
2022: US Open final & top 15 in doubles, top 100 in singles At the
St. Petersburg Trophy in February, McNally teamed up with
Anna Kalinskaya to win the doubles title, beating Polish
Alicja Rosolska and New Zealander
Erin Routliffe in the final; it was her fifth on the WTA Tour. The win took her to a career high No. 16 in the rankings on February 14, 2022. She reached a second doubles final for the season with Kalinskaya at the
Washington Open, defeating second seeded Belgian pair of world No. 1 in doubles, Elise Mertens, and
Greet Minnen. They lost in the final to top seeded
Jessica Pegula and Erin Routliffe. At the
US Open, she and Taylor Townsend reached the
doubles final, losing to Krejčíková and Siniaková. At the
Ostrava Open the following month, she reached the quarterfinals of the singles before being beaten by
Iga Świątek. In
doubles, she teamed up with
Alycia Parks for the first time. They were unseeded, but beat the first and fourth seeds en route to the final, where they beat third seeds Rosolska and Routliffe to win the title. It was McNally's sixth doubles title. In November, she won her first
WTA 125 title at the
Midland Classic defeating
Anna-Lena Friedsam in straight sets and made her top 100 debut in singles, at world No. 94 on November 7, 2022.
2023: Top 60 in singles, hiatus due to injury At the
Mérida Open, McNally reached her second WTA Tour semifinal defeating third seed Zhu Lin,
Katie Volynets and
Kimberly Birrell. She then lost to qualifier
Rebecca Peterson. As a result, she reached the top 75, rising 17 positions. At the same tournament, playing with
Diane Parry, she won her seventh
doubles title, beating
Wang Xinyu and
Wu Fang-hsien in the final. In what turned out to be her last event of the season, McNally lost in the first round at
Wimbledon to
Jodie Burrage. An elbow injury subsequently forced her to withdraw from the
US Open.
2024: Transylvania Open doubles title, elbow surgery and comeback McNally withdrew from the
Australian Open. She briefly returned to the tour in February, playing at the
Transylvania Open, where she won the doubles title with
Asia Muhammad, as well as tournaments in Linz and Puerto Vallarta, before undergoing surgery on her elbow at the renowned Andrews Sports Medicine and Orthopaedic Center in Alabama in March. She made her comeback in November 2024 at the WTA 125
Dow Tennis Classic in
Midland, Michigan, defeating
Leonie Küng in the first round, before losing her next match to
Alycia Parks. The following month, McNally won her first title since her return to action at the
Tampa W50 event, and as a result, jumped 223 places in the WTA singles rankings to world No. 543.
2025: Second WTA 125 singles title, first Wimbledon win Using her protected ranking to gain entry into the main-draw at the
Australian Open, McNally lost to
Varvara Gracheva in the first round. Again competing under her protected ranking, she entered the WTA 1000 event at
Indian Wells and advanced to the second round when her opening match opponent,
Ajla Tomljanović, retired after McNally won the first set. She lost her next match to 24th seed
Liudmila Samsonova. At the
Miami Open, she once more entered the main draw using her protected ranking, but lost in the first round to
Viktoriya Tomova in three sets. McNally qualified for the
Charleston Open and defeated
Anhelina Kalinina in the first round, before losing to 14th seed
Anna Kalinskaya in her next match. At
Wimbledon, McNally once again used her protected ranking to gain entry into the main-draw and overcame wildcard entrant
Jodie Burrage to make it into the second round, where she lost to eighth seed and eventual champion
Iga Świątek. McNally won her second WTA 125 singles title at the
Hall of Fame Open, defeating top seed
Tatjana Maria in the final. The following week she made it back-to-back titles by winning the Evansville ITF W100 and moved up to world No. 116 as a result. Using her protected ranking, McNally entered the main-draw at the
Canadian Open and defeated
Alycia Parks in a deciding set tiebreak and 31st seed
Rebecca Šramková in straight sets to reach the third round, at which point she lost to sixth seed
Madison Keys, bringing an end to her 12 match winning streak. Ranked at world No. 104 and given a wildcard into the main-draw at the
Cincinnati Open, she defeated qualifier
Maddison Inglis, before losing to 29th seed
McCartney Kessler in the second round. McNally won the
USTA Wildcard Challenge to gain entry into the main-draw at the
US Open. She defeated
Jil Teichmann, before losing to 10th seed
Emma Navarro in the second round. Partnering
Maya Joint, she was runner-up in the doubles at the
Korea Open in September, losing to
Barbora Krejčíková and
Kateřina Siniaková in the final. The following month at the
Guangzhou Open, McNally defeated qualifier
Kaja Juvan and
Ajla Tomljanović to reach her first WTA quarterfinal since 2023, at which point she lost to
Lulu Sun.
2026: Charleston doubles title, first WTA 1000 fourth round At the
Australian Open, McNally overcame qualifier
Himeno Sakatsume, before losing to 17th seed
Victoria Mboko in the second round. Seeded sixth at the
Ostrava Open in February, she defeated
Suzan Lamens and wildcard entrant
Tereza Martincová to make it through to the quarterfinals at which point her run was ended by
Tamara Korpatsch. The following month, McNally registered wins over qualifier
Rebeka Masarova and 29th seed Wang Xinyu to reach the third round at the WTA 1000
Miami Open, where she lost to world No. 1
Aryna Sabalenka. Teaming up with
Desirae Krawczyk, she won the doubles title at the
Charleston Open, defeating
Anna Bondár and
Magdalena Fręch in the final. At the
Madrid Open, McNally defeated qualifier Katie Volynets and then 10th seed Victoria Mboko for her first win against a top-10 ranked player. Next she overcame Kateřina Siniaková to make it into her first WTA 1000 fourth round, at which stage she lost to 26th seed
Marta Kostyuk. ==Performance timelines==