Finished school two years early — now inside the world's top 100
Right-handed and Hamburg-born, she qualified for her Grand Slam debut at 18, beat a top-10 seed in Cincinnati at 20, and reached a career-high No. 78 in January 2026.
Career-High Rank
No. 78
12 JAN 2026
Current Rank
No. 78
13 JAN 2026
Age
20
B. 14 FEB 2005
ITF Titles
5
HAMBURG, GER
Birthplace
Hamburg, Germany
Residence
Hamburg, Germany
Height
176 cm (5'9")
Plays
Right-handed
Team Germany
BJK Cup debut 2025
Best Slam
1R — AO, RG, Wimbledon
Seidel's rise ran through the 2025 hard-court summer. Ranked No. 127, she qualified for her first WTA 1000 main draw in Cincinnati and found herself 4-1 down in the deciding set against No. 8 seed Emma Navarro — then reeled off the comeback for her first career top-20 win and a run to the last 16. A month later in Seoul she saved a match point and outlasted defending champion Beatriz Haddad Maia in a three-hour, twenty-eight-minute epic, one of the longest WTA matches of the season. Three tour-level quarterfinals in 2025 carried her into the top 100 for the first time on 22 September.
"It was gigantic to walk into Rod Laver Arena!" — On her Grand Slam debut against Sabalenka, tennisnet.com (translated from German)
The climb kept going into the new season. A first-round win over Monique Barry at the Auckland ASB Classic helped lift her to a career-high No. 78 on 12 January 2026 — two years to the week after she had walked onto Rod Laver Arena as an 18-year-old qualifier to face the defending champion. Part of a young German wave alongside Eva Lys, the Hamburg product — who graduated from the city's Sportgymnasium Alter Teichweg two years early, at 17, to commit to the tour — entered the 2026 Australian Open ranked inside the world's top 80 for the first time.
"My dream is to win a Grand Slam tournament."
ON HER CAREER GOALS · TENNISNET.COM, 2024 (TRANSLATED FROM GERMAN)"Ambitious, yes — with me, everything is a competition!"
ON HER MENTALITY · TENNISNET.COM, 2024 (TRANSLATED FROM GERMAN)"I try to shape my game directly with serve and forehand."
ON HER PLAYING STYLE · TENNISNET.COM, 2024 (TRANSLATED FROM GERMAN)