2021 Korneeva finished runner-up at the European Junior Championships under-14 girls singles to the Czech player
Tereza Valentová.
2022 On the
ITF Junior Circuit, in 2022 Korneeva's tally of six singles titles saw her claim the most singles titles in girls’ tennis that year. Korneeva won her first $15k event in Casablanca in September, defeating
Laura Hietaranta in the final.
2023: No. 1 junior, WTA Tour debut Korneeva had success in her junior Grand Slam debut at the
Australian Open, reaching the semifinals of the
girls' doubles with partner
Mirra Andreeva, and defeating Andreeva in three sets in the final of the
girls' singles. Before their final, Andreeva said, "She is a really good friend of mine, my best friend." After the match, Korneeva told her on court, "It's not our last battle. We will have a lot of good matches when you will win, when I will win...it was a hard battle." In the quarterfinals of the girls singles, Korneeva defeated second seed
Tereza Valentová, who 18 months prior, had defeated Korneeva in the under-14 girls singles final at the European Junior Championships. In March, Korneeva qualified for the main draw of the 60k event in Pretoria and won the tournament, defeating
Tímea Babos in the final, in straight sets. At age 15 years, eight months and 18 days, Korneeva became the fifth youngest player in history to win an ITF tournament at 60k level or above. On 1 May, Korneeva became No. 1 in the
junior world rankings. In June, she won her second junior major title, defeating
Lucciana Pérez Alarcón in the final of the
French Open girls' singles in straight sets, becoming the first player since
Magdalena Maleeva in 1990 to win the first two Grand Slam tournaments in girls' singles in the same year. Together with
Sara Saito, Korneeva also reached the final of the
girls' doubles, losing to
Tyra Caterina Grant and
Iva Jovic. In July, Korneeva qualified for the main draw and won the W100
Figueira da Foz Open, defeating French player
Carole Monnet in the final 6–0, 6–0, and becoming the youngest player to win a W100 title. Together with
Anastasia Tikhonova, she also reached the final of the same event in doubles. In October, she qualified for the
Hong Kong Open making her WTA Tour debut, and defeated compatriot
Valeria Savinykh for her first tour win. She lost to
Linda Fruhvirtová in the second round. On 22 October, Korneeva won the 2023 ITF World Tennis Tour Junior Finals, defeating Sara Saito in the final.
2024: Major debut and first win, WTA Tour doubles final In the last round of
qualifying at the Australian Open, Korneeva defeated
Anna Bondár in straight sets to qualify for the
main draw, making her major debut. She defeated
Sara Sorribes Tormo in the first round, before losing in the second round to tenth-seed
Beatriz Haddad Maia. At the
Jasmin Open, Korneeva reached her first career final in doubles, partnering
Anastasia Zakharova. They lost to
Anna Blinkova and
Mayar Sherif, in three sets. Partnering
Polina Kudermetova, she was runner-up in the doubles at the
WTA 125 Abierto Tampico, losing to
Carmen Corley and
Rebecca Marino in the final. Korneeva reached her first WTA Tour singles semifinal at the
Mérida Open with wins over
Alycia Parks, fifth seed
Anna Blinkova and
Sara Sorribes Tormo. She lost in the last four to
Zeynep Sönmez.
2025: 3 ITF titles In July, Korneeva reached the final of
W100 Figueira da Foz International, where she lost to
Maria Timofeeva. As a result she re-entered, top 200 in WTA rankings. She then won the titles of W50
Leira and W50
Evora in Portugal back-to-back in September to reach World No. 156 in rankings. She won the title of
W75 Slovak Open, defeating
Lucie Havlickova in the final. She also qualified for the main draw of
Guangzhou losing to sixth seed
Yulia Putintseva in the first round.
2026: First WTA 125 title Korneeva started the year winning ITF title at W75 event in Manama, Bahrain beating
Fiona Ferro in the final in straight sets. In February 2026, Korneeva won her first
WTA 125 title at the
Oeiras 1 Jamor Indoor defeating
Darja Vidmanova 7-5, 6-1 in the final. ==Personal background==