Tennis - Birthday heartache looms in Paris - guaranteed

Tennis - French Open - Roland Garros, Paris, France - June 6, 2017 Switzerland's Timea Bacsinszky celebrates winning her quarter final match against France's Kristina Mladenovic Reuters / Christian Hartmann

PARIS (Reuters) - Two birthdays, one present.

Timea Bacsinszky and Jelena Ostapenko will celebrate birthdays on Thursday, but one will be left crying into her cake as they face off in the French Open semi-finals.

Swiss Bacsinszky beat local darling Kristina Mladenovic 6-4 6-4 in the last eight while Latvian Ostapenko downed former world one Caroline Wozniacki.

Jun 6, 2017; Paris, France; Jelena Ostapenko (LAT) reacts during her match against Caroline Wozniacki (DEN) on day ten of the 2017 French Open tennis tournament at Stade Roland Garros. Mandatory Credit: Susan Mullane-USA TODAY Sports

Bacsinszky turns 28 on Thursday, while Ostapenko will leave her teens behind.

"It will be great to celebrate playing tennis here," said Ostapenko, the first teenager since Serb Ana Ivanovic in 2008 to reach the last four in Roland Garros.

"Lucky her, she's way younger than I am," Bacsinszky joked.

"But maybe lucky me, experience-wise."

(Reporting by Julien Pretot; Editing by Ossian Shine)