Jeļena "Aļona" Ostapenko (born 8 June 1997) is a Latvian professional tennis player. She has a career-high singles ranking of world No. 5 in singles by the WTA, achieved in March 2018, and No. 3 in doubles, attained in July 2025. Ostapenko has won nine WTA Tour–level singles titles, including a major at the 2017 French Open, and 13 doubles titles, including two majors at the 2024 US Open in women's doubles with Lyudmyla Kichenok and at the 2026 Wimbledon Championships in mixed doubles with Marcelo Arévalo. She is the current No. 1 player from Latvia.
Ostapenko has also won 15 singles titles and 15 doubles titles on the ITF Women's Circuit, and the junior singles event at the 2014 Wimbledon Championships. She is a member of the Latvia Billie Jean King Cup team.
Ostapenko was born on 8 June 1997 in Riga, Latvia to former Ukrainian footballer, Jevgēnijs Ostapenko (d. 2020) and Latvian-Russian tennis coach and former player, Jeļena Jakovļeva. Jevgēnijs played professional football for Metalurh Zaporizhzhia in the southeastern Ukrainian city of Zaporizhzhia, where Jeļena's grandmother lives. Jeļena has one half-brother, Maksim, who lives in the United States.
Ostapenko was introduced to tennis at age five by her mother and idolised Serena Williams while growing up. She also started dancing at that age, going on to compete in the national ballroom dance championships of Latvia. At the age of 12, she chose to focus on tennis, but she credits her good coordination and skilled footwork to the years she danced competitively. Ostapenko speaks Latvian, Russian, and English.
Her legal name is Jeļena, but she is known to her family and friends as Aļona. When she was born, her parents' desired name of Aļona was not on the Latvian name calendar, so she was named Jeļena after her mother. Latvian authorities, however, have claimed that there were no restrictions in place at that time to register any name, and that there had been some misunderstanding. Fans in Latvia and elsewhere had always called her Aļona, but the name was unknown in the West until her win at Roland Garros in 2017. She uses her legal name professionally in order to avoid administrative confusion.
2014: Wimbledon junior champion, WTA Tour debut
Ostapenko won the singles event at the junior Wimbledon Championships and was ranked the No. 2 junior tennis player in the world in September 2014. She made her WTA Tour main-draw debut at the Tashkent Open, having been awarded a wildcard and recorded her first win.
At the Ladies Neva Cup, Ostapenko went through qualifying and won the biggest title thus far. At Wimbledon, Ostapenko defeated the ninth-seeded Carla Suárez Navarro in straight sets (dropping only two games in the match and grabbing her first win over a top-ten player) in the first round, before losing to Kristina Mladenovic.
At the US Open, she lost her second-round match to Sara Errani.
In September, she reached her first WTA Tour final at the Canadian Open, where she lost to Annika Beck.
She ended the season as the world No. 79.
2016: Qatar final, Wimbledon mixed semifinal
She reached the final of the Premier 5 Qatar Ladies Open in Doha, beating world No. 8, Petra Kvitová, on the way. She was beaten by Carla Suárez Navarro in the final, nevertheless she rose to No. 41 in the world rankings.
At the French Open, Ostapenko was seeded in the singles at a Grand Slam tournament for the first time in her career, but she dropped her opening match to Naomi Osaka.
At the Birmingham Classic, she beat Anastasia Pavlyuchenkova in straight sets in the first round, and two-time Wimbledon champion Petra Kvitová in the second before she was defeated by Madison Keys in the quarterfinals. Ostapenko made the semifinals in mixed doubles at Wimbledon with Oliver Marach, before they fell to the eventual champions, Heather Watson and Henri Kontinen.
Ostapenko made her Olympic debut at the 2016 Rio Summer Olympics but lost to Samantha Stosur in the first round.
She ended the season ranked No. 44 in the world.
2017: French Open champion, top 10 in singles