2025 Transylvania Open – Singles
| Singles | |
|---|---|
| 2025 Transylvania Open | |
| Champion | Anastasia Potapova |
| Runner-up | Lucia Bronzetti |
| Score | 4–6, 6–1, 6–2 |
| Draw | 32 (3 WC, 6Q) |
| Seeds | 8 |
Anastasia Potapova defeated Lucia Bronzetti in the final, 4–6, 6–1, 6–2 to win the singles title at the 2025 Transylvania Open. It was her third career WTA Tour title.
Karolína Plíšková was the reigning champion, but did not participate this year.
This tournament marked the final professional appearance of two-time major champion and former world No. 1 Simona Halep, who announced her retirement from professional tennis at the tournament. She lost to Bronzetti in the first round.
The first round match between Viktorija Golubic and Arantxa Rus was the longest match on the 2025 WTA Tour thus far. It lasted 3 hours and 30 minutes and had the joint-third longest regular (first to seven) third-set tiebreak of the 2020s (with a 12–10 final scoreline).