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They are both in a Grand Slam semifinal for the first time - and for the 26-year-old Petkovic it’s a very scary feeling.

Petkovic considered retiring from tennis after a succession of injuries to her back, ankle and knee saw her drop out of the top 10 and plummet to 143rd. She missed five of the eight Grand Slams in 2012 and 2013.

“I’m just so scared that it might slip away,” Petkovic said. “So now every time I have happy moments and nice wins, it immediately brings the doubt and the fear.”

Petkovic beat 10th-seeded Sara Errani, the 2012 French Open runner-up, 6-2, 6-2.

“When it was 6 2, 5-2 I sat down and I said to myself, ‘OK, Andrea, are you going to get tight now? And I paused and I said, ‘No, not now.’”

In Thursday’s other semifinal, the seventh-seeded Sharapova leads the 18th-seeded Bouchard 2-0, beating her in the second round at Roland Garros last year. Sharapova rallied from a set down to beat Halep in the Madrid Masters final last month.