Dayana Yastremska

Yastremska had a strong start to the 2020 season. She reached the final at the Premier-level Adelaide International. During the event, she defeated three top 20 players, including No. 12 Aryna Sabalenka, before finishing runner-up to world No. 1 Ashleigh Barty, who won the title in her home country. In the Australian Open she beat Kaja Juvan in the first round before falling to Caroline Wozniacki in the second, the Dane's final tournament victory before her retirement.

Yastremska released her first single, "Thousands of Me", on Youtube on 12 May 2020.

Yastremska made her debut for Ukraine Fed Cup team at the 2019 Fed Cup. The team was playing a tie against the host country Poland in a third-place play-off for Europe/Africa Zone Group I. Although Yastremska won the second singles rubber against Iga Świątek, Ukraine lost the tie after failing to win either the first singles rubber or the decisive doubles rubber, the latter of which ended in a third-set tiebreak.

Yastremska's coach Sascha Bajin described her playing style as, "She’s a great mover and she has incredible power. Her ground strokes are very powerful." Yastremska has a highly aggressive, attacking style and can hit high numbers of winners. She had 33 winners in the finals when she won her first two title matches, and 49 winners when she won her third title. She also can hit a high number of unforced errors while going for winners, totaling 21, 53, and 50 such errors in those three matches. As of the 2019 Australian Open, Yastremska was ranked as the most aggressive player on the WTA Tour, having led the tour with 28.6 per cent of her shots ending in a winner, an unforced error, or an opponent's forced error, a statistic known as her Aggression Score. Her average first serve speed is about 100 miles per hour (160 km/h), and can scale 115 mph (185 km/h); a tendency to take risks on her second serve can lead to a high double fault count, however. Yastremska has been noted for her tough mentality and competitive spirit, being described as "playing the big points fearlessly", and her ability to hit winners from any position on the court has been described as "jaw-dropping". Her strongest shots are her backhand down the line, and her inside-out forehand. Yastremska's quick and aggressive style of play has earned her comparisons to Jeļena Ostapenko, her former doubles partner, and Aryna Sabalenka, some of the most aggressive players on the WTA tour.

Yastremska has been endorsed by Yonex for clothing, apparel, and rackets since 2019. She was previously endorsed by Nike.

At the 2019 Australian Open, Yastremska's mother suffered an eye injury after a champagne bottle that she was holding exploded unexpectedly. She had immediate surgery to save her eye, which was coordinated in part by Elina Svitolina's agent Stefan Gurov and financially covered by tournament director Craig Tiley. Yastremska dedicated her title at the Hua Hin Championships the following month to her mother as a result of this incident.

A junior Grand Slam runner-up in both singles and doubles, Yastremska had a quick breakthrough onto the WTA Tour. She made her debut in the top 100 and won two titles when she was 18 years old, including her first at the Hong Kong Tennis Open in 2018. She had a successful 2019 that helped her rise from No. 58 at the start of the year up to No. 22 by the end of the season.

Yastremska had a slow start to the 2018 season. She lost in the second round of qualifying at the Australian Open. After injuring her ankle at the Abierto Mexicano in February, she did not enter any tournaments in March. With a ranking well outside of the top 100, she needed to enter qualifying at her first seven tournaments of the year, reaching three main draws. At the last of these events, Yastremska produced her best result, finishing runner-up to Rebecca Peterson at the $100K Open de Cagnes-sur-Mer. This result took her into the top 150 for the first time. She also reached the $100K final at the Ilkley Trophy, losing to Tereza Smitková in a third-set tiebreak. She did not enter the French Open and lost in the qualifying competition at Wimbledon. During the second week of Wimbledon, Yastremska won the separate $60K Torneo Internazionale Femminile Antico Tiro a Volo in Rome. She defeated Potapova in the final in 45 minutes, only losing one game. With this title, she made her debut in the top 100 at the age of 18.

Yastremska's parents have both been a part of her coaching team, with her mother continuing to serve as her mental coach. When Yastremska was a junior, she had a variety of different coaches. She worked with former top 100 player Viktoriya Kutuzova and Kutuzova's father Valery. She later worked with another former top 100 player in Jean-René Lisnard and then former world No. 2 Magnus Norman. As a professional in 2017, she has trained in Istanbul with Gavin Hopper, a former coach of Monica Seles. Yastremska later began training at the Justine Henin Academy, with Henin becoming her consultant in 2018. She worked with one of the academy's coaches, Oliver Jeunehomme, until September 2019. In the offseason, she hired Sascha Bajin as her new coach.

Yastremska made her junior Grand Slam debut at the 2016 Australian Open, where she made the singles quarterfinals. In doubles, she made it to the final, losing to Anna Kalinskaya and Tereza Mihalíková alongside compatriot Anastasia Zarycká. Yastremska only played Grade A tournaments the rest of the year. At the Copa Gerdau, she lost in the singles semifinals to Amanda Anisimova. In the doubles event, she partnered with Panna Udvardy to win the only Grade A title of her career, defeating the American team of Caty McNally and Natasha Subhash. After a third round appearance in singles at the 2016 French Open, Yastremska concluded her junior career at Wimbledon. At her last event, she made her only junior Grand Slam singles final. After upsetting top seed Olesya Pervushina in the semifinals, she finished runner-up to Anastasia Potapova. This helped her reach a career-high junior ranking of No. 6 in the world.

Yastremska began playing low-level events on the ITF Women's Circuit in 2015. Her best result of the year was a semifinal loss to Markéta Vondroušová at a $10K event in Sharm El Sheikh. She won her first ITF title in March 2016 at the $25K event in Campinas, Brazil, where she came through qualifying and defeated No. 157 Alizé Lim in the final. A month and a half later, she made her WTA main draw debut at the İstanbul Cup at the age of 15. As a wild card, she lost her opening round match to Nao Hibino. A year later, Yastremska was awarded another wild card into the same tournament and defeated Andrea Petkovic for her first career WTA match win. She made it to the quarterfinals, where she lost to Jana Čepelová despite having two chances to serve for the match. Yastremska qualified for her only other WTA main draw of the year at the Nottingham Open, losing in the first round. In September, Yastremska won an ITF $60K title at the Ladies Open Dunakeszi. With this title, she rose from No. 272 to No. 202 in the world. Later that month, she defeated top seed and world No. 46 Donna Vekic in the semifinals of the $100K Neva Cup before losing to Belinda Bencic in the final. This runner-up finish brought her into the top 200 for the first time at No. 174. Yastremska also had a strong season in doubles, winning three ITF titles, including the $80K Prague Open with Anastasia Potapova.

Yastremska had early success as a junior, finishing runner-up at the 12-and-under Junior Orange Bowl in 2012. She made her debut on the ITF Junior Circuit in March 2014 at the age of 13. Towards the end of the year, she won her first title at a Grade 4 event in November. With this success, she moved up to playing higher-level tournaments more regularly. Yastremska reached a Grade 1 semifinal in July in Austria and won a Grade 2 title in August in Hungary. She made her debut at the highest-level Grade A tournaments in October, reaching the quarterfinals at the Osaka Mayor's Cup in Japan. She fared better in doubles, finishing runner-up to two Japanese players.

Dayana Oleksandrívna Yastremska (Ukrainian: Даяна Олександрівна Ястремська ; born 15 May 2000) is a Ukrainian professional tennis player. She has a career-high Women's Tennis Association (WTA) ranking of No. 21 in the world, and in 2020 was the second-highest ranked teenager behind Bianca Andreescu. Yastremska has won three WTA titles in four finals appearances.

Dayana Yastremska was born on 15 May 2000 to Marina and Alexander Yastremsky in Odessa, the third-largest city in Ukraine. She has a sister Ivanna who is six years younger. Her father had been a volleyball player and also has served on the Odessa City Council. When Yastremska was five years old, her grandfather Ivan introduced her to tennis. After trying other sports such as gymnastics and swimming, she chose to focus on tennis, saying at the age of twelve, "I chose tennis because it is very hard and beautiful. I love work and I want to write my new history in tennis." She entered her first tournament when she was seven and finished in third place, despite the event being open to children who were several years older. Yastremska credits her parents for her success at tennis, saying, "When I was younger I had to sacrifice a lot of things but now I’m not regretting it... I have to say a big thank you to my parents because if they didn’t push me in the right moment then I don’t think I’d have the life I have right now."