Marta Kostyuk has spent years as one of tennis’s most talked-about prospects, and in 2026 she turned that promise into a breakthrough. The Ukrainian won the biggest title of her career at the Madrid Open — a WTA 1000 — rode a long clay-court winning streak, and reached her first Grand Slam semifinal at Roland Garros, climbing to a career-high ranking in the process.
A powerful, strong-willed competitor who first made headlines as a 15-year-old qualifier, Kostyuk has matured into a genuine contender. She has also been one of the sport’s most outspoken figures on the war in Ukraine. The profile is a rising force entering the prime of her career.
Quick facts
- Full name: Marta Kostyuk
- Nationality: Ukraine (born Kyiv)
- Born: June 28, 2002
- Height: 5 ft 7 in (1.70 m)
- Turned pro: 2016
- Plays: Right-handed, two-handed backhand
- Coach: Sandra Zaniewska
- Identity: Powerful, aggressive baseliner with a strong competitive temperament
Season snapshot — June 2026
- Current standing: Career-high around World No. 12 (verify against the live WTA list before publishing; the rankings update on June 8)
- 2026 breakthrough: Won the Madrid Open (a maiden WTA 1000 title), built a 17-match clay-court winning streak, and reached her first Grand Slam semifinal at Roland Garros (beating compatriot Elina Svitolina in the quarterfinals before losing to Mirra Andreeva)
- Career-high: Around World No. 12 (2026)
- Career titles: 3 (Austin 2023, Rouen and Madrid 2026)
- Best major results: Roland Garros semifinal (2026); Australian Open quarterfinal (2024)
Snapshot data is time-sensitive and scheduled for quarterly review.
Snapshot
Kostyuk plays an aggressive, front-foot game built on clean, powerful hitting and a fierce competitive edge. A junior Grand Slam champion who reached the Australian Open third round as a 15-year-old qualifier, she has steadily climbed the rankings and, under coach Sandra Zaniewska, found the consistency to match her firepower in 2026.
Playing style and strengths
Power off both wings. Clean, aggressive hitting that dictates rallies.
Competitive fire. A strong-willed temperament that lifts her in big matches.
Improved consistency. A more complete, reliable game in her breakthrough season.
Pressure points and vulnerabilities
- Managing emotion and intensity in the tightest moments
- Backing up her 2026 breakthrough across surfaces and seasons
- Building on a first major semifinal toward a final
- Sustaining her new career-high ranking against a deep field
Career milestones
- 2017: Australian Open girls’ singles champion
- 2018: Reached the Australian Open third round as a 15-year-old qualifier
- 2024: First Grand Slam quarterfinal at the Australian Open
- 2026: Madrid WTA 1000 title and a maiden Roland Garros semifinal, with a career-high ranking
Grand Slam record in context
Kostyuk’s major record took a decisive step forward in 2026 with a first Grand Slam semifinal at Roland Garros, adding to her 2024 Australian Open quarterfinal. The pattern is a long-touted talent finally delivering deep runs at the majors. Building on that — and challenging the very top in the final stages — is the measure of whether she becomes a regular contender.
What to watch next
- A first major final — building on her Roland Garros semifinal
- Surface range — translating her clay breakthrough onto hard courts and grass
- Ranking — pushing from a career-high toward the top 10
