Katie Charlotte Boulter (born 1 August 1996) is a British professional tennis player. She has a career-high singles ranking by the WTA of 23, achieved on 4 November 2024, and a best doubles ranking of No. 225, reached on 8 June 2026. Boulter has won four singles titles on the WTA Tour. She has also won one WTA 125 singles title, as well as seven singles and four doubles titles on the ITF Women's Circuit. She is a former British women’s No. 1.
Boulter was ranked the No. 10 junior tennis player in the world in March 2014. She is based at the Lawn Tennis Association's National Tennis Centre in Roehampton and was coached by Jeremy Bates, Nigel Sears, Timothy Seals, and Mark Taylor.
Boulter was born in Woodhouse Eaves, Leicestershire.
Boulter started playing tennis aged 5, and went on to represent Great Britain three years later, aged 8. She has said that when she was younger, beating her older brother was a motivating factor. "We used to practise together at this local court down the road from our house. It was the only thing I could eventually beat him in, so that felt great."
Boulter played the piano before her tennis career began to take precedence. She also has an interest in fashion and made an appearance in Vogue magazine in 2018.
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.
2014: Doubles success, first pro singles title
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 wildcard 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 wildcard 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.
2019: Australian Open first win
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.