Katie Boulter

Following in the path of Anna Kournikova, Boulter showed promise in 2008 when she won the Lemon Bowl in Rome, aged 11. She went on in 2011, aged 14, to become a finalist in the Junior Orange Bowl Tennis Championships in Coral Gables, Florida. Past finalists have included Andy Murray and Caroline Wozniacki. She was awarded the Aegon Junior Player Award that month.

Boulter claimed her first senior doubles title at a $10k event in Sharm El Sheikh in November 2013.

In January 2014, Boulter went on to have further doubles success and was a finalist at the Australian Open girls' doubles event with Ivana Jorović. In May 2014, in Sharm El Sheikh, Boulter won her first senior singles title over fellow Briton Eden Silva. She also won the doubles title at the same event partnering Nina Stojanović, to whom she had lost a previous final in singles. A month later, Boulter was given a wild card for Wimbledon qualifying, losing in the first round to Italian Alberta Brianti in a three-set match which lasted two-and-a-half hours.

Boulter won her first $25k singles title at the event in Óbidos, Portugal in April. In May, she won a further singles title at the $60k event in Fukuoka, Japan. She received a wild card for the Nottingham Open, going on to reach her first WTA Tour quarterfinal with a run which included a win over former US Open champion Samantha Stosur. In July, Boulter received a wildcard into the $100k grass-court event in Southsea, England, where she reached the final and fell to Kirsten Flipkens.

She then received a wildcard into the Wimbledon main draw, where she won her first-round match over Verónica Cepede Royg. She lost in the second round to Naomi Osaka in straight sets.

Boulter began the 2019 season in Hobart, Tasmania where she did not qualify, losing to Greet Minnen in three sets. Her next tournament was the Australian Open. She defeated Ekaterina Makarova, in three sets, with the first instance in the Australian Open of a third-set tiebreak, winning the tiebreak 10–6. However, her run ended in the second round with a straight-sets defeat by Aryna Sabalenka.

Her next tournament was the St. Petersburg Ladies' Trophy where she entered the main draw as a lucky loser and was defeated by Ekaterina Alexandrova in three sets. At the Mexican Open, she defeated Conny Perrin in the first round, before retiring with an injury during her next match against fifth seed Sofia Kenin.

In April, Boulter suffered a spinal stress fracture while playing for Great Britain in the Fed Cup.

At the 2021 Australian Open, she suffered a first-round loss against Daria Kasatkina. At Wimbledon, she beat qualifier Danielle Lao, before losing to second seed Aryna Sabalenka, in three sets, in the second round. She qualified for the main draw at the 2021 US Open, but lost in the first round to Liudmila Samsonova.

Having won an ITF tournament in February 2022, Boulter had to retire from the WTA event in Lyon in March due to a leg injury.

Boulter missed the clay-court season, but returned at the Nottingham Open in June where she came through qualifying to defeat Tatjana Maria in the first round before losing to Ajla Tomljanović. Granted a wildcard for the Birmingham Classic, she defeated Alison Riske (her first win against a top-40 ranked player) and Caroline Garcia, before losing to Simona Halep. At Eastbourne, she was also handed a wildcard and defeated fourth seed and world No. 7, Karolina Plíšková, for her first top-10 win. She lost her last 16 match against Petra Kvitová in three sets.

At Wimbledon, Boulter again upset Plíšková in three sets to advance to the third round of a major for the first time in her career. In round three, Boulter lost to Harmony Tan, in straight sets.

Boulter became the British player No. 1 on 12 June 2023, following a semifinal showing at the Surbiton Trophy. She reached the quarterfinals at the Nottingham Open as one of four British players for a historic first at a WTA event. She went one step further to reach her first WTA Tour semifinal with a win over compatriot Harriet Dart. She defeated another Briton, Heather Watson, to set up an all-British final with Jodie Burrage, the first since 1977. As a result, she returned to the top 100 in the rankings at No. 77 on 19 June 2023. She had won her first WTA Tour title, after defeating Burrage in the final.

She received a special exempt entry into the next UK tournament in Birmingham, but lost in the first round to Zhu Lin in straight sets.

At Wimbledon, she defeated Australian Daria Saville in the first round and Bulgarian Viktoriya Tomova in the second, before losing to Elena Rybakina in an under-one-hour match. With Alex de Minaur in mixed doubles, she also went out in the second round.

Boulter came through two rounds of qualifying to gain a place in the main draw of the Canadian Open in Montreal. She won her first-round match against Rebecca Marino, but lost in round two to Coco Gauff. This result improved Boulter's singles ranking to a career high of 60, on 14 August 2023.

At the US Open, she entered the main draw via her ranking for the first time in her career. In the first round, she defeated Diane Parry in straight sets for her first-ever main-draw win at Flushing Meadows, and then beat Chinese player Wang Yafan, in three sets, in the second round. Boulter lost to Peyton Stearns in round three, in two sets, but reached a new career-high ranking of 50, on 11 September 2023.

Boulter was a member of the Great Britain team for the 2024 United Cup alongside Cameron Norrie. She defeated Jessica Pegula in the round-robin stage but the team was eliminated before the knock-out phase. She reached the second round of the Australian Open with a win over Yue Yuan but lost to 12th sedd and eventual runner-up Zheng Qinwen. Boulter played the Linz Open where she defeated sixth seed Jasmine Paolini, before losing to Anastasia Pavlyuchenkova in the second round.

At the San Diego Open, the unseeded Boulter defeated Lesia Tsurenko, second seed Beatriz Haddad Maia, seventh seed Donna Vekić, and third seed Emma Navarro to reach her first WTA 500 final. In the final, she defeated the sixth seeded Marta Kostyuk achieving her first win at this level and taking her ranking into the top 30.

In April, Boulter helped Great Britain to a 3–1 win in an away tie against France to make it into the Billie Jean King Cup finals. Having lost to Diane Parry 2–6, 0–6 on day one, Boulter defeated Clara Burel 7–5, 6–0 in the opening match of day two for what was her first Tour-level victory on clay.

Boulter retained her Nottingham Open title in June, beating Emma Raducanu in the semifinals, and then Karolína Plíšková in the final on the same day at the tournament which was heavily affected by bad weather.

For the first time in her career, Boulter was seeded in the singles at Wimbledon. She defeated Tatjana Maria in two sets, but then lost to fellow Briton Harriet Dart in the second round, 8–10 in the third set tiebreaker.

Boulter lost in the first round of the singles at the Paris Olympics, going down in straight sets to Anna Karolína Schmiedlová. Partnering Heather Watson, she reached the quarterfinals of the doubles, defeating sixth seeded Brazilian duo Beatriz Haddad Maia and Luisa Stefani in the second round, before losing to third seeds and eventual gold medalists Sara Errani and Jasmine Paolini from Italy.

In her first tournament after the Olympics, Boulter reached the third round of the Canadian Open for the first time in her career with wins over Bernarda Pera and 13th seed Beatriz Haddad Maia to set up a meeting with second seed Aryna Sabalenka which she lost.

Seeded 31st, she defeated qualifier Aliaksandra Sasnovich in the first round at the US Open, before losing her next match to Jéssica Bouzas Maneiro. Having received a bye into the second round, and seeded 26th, at the China Open, Boulter defeated Taylor Townsend in straight sets. She lost in the third round to fourth seed Coco Gauff. At the final WTA 1000 event of the season, the Wuhan Open, Boulter lost in the first round to qualifier Lesia Tsurenko.

Boulter defeated Sara Errani in the first round at the Ningbo Open to set up a meeting with sixth seed Beatriz Haddad Maia which she lost in straight sets. Seeded ninth at the Pan Pacific Open, She defeated qualifier Priscilla Hon, lucky loser Kyōka Okamura and Bianca Andreescu to reach the semifinals where she lost to wildcard Sofia Kenin. At the Hong Kong Open, where she was second seed, Boulter defeated Aoi Ito, Wang Xiyu, Anastasia Zakharova and sixth seed Yue Yuan to reach in her third final of the year, which she lost to top seed Diana Shnaider. Despite the defeat, Boulter moved into the world's top-25 for the first time, reaching No. 23 in the WTA rankings.

At the Billie Jean King Cup finals in Spain, Boulter defeated Laura Siegemund in straight sets to seal Great Britain's first round win over Germany. She then overcame Leylah Fernandez as Great Britain defeated defending champions Canada to reach the semifinals. In their last four match against Slovakia, Boulter lost to Rebecca Šramková in three sets as Great Britain were defeated 2–1.