Panic attack derails former champion Halep at French Open
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The distressed 19th-seeded Romanian slumped in her chair at the end of the first set and required the attention of the doctor.
"It was just a panic attack. I didn't know how to handle it, because I don't have it often," said the 2018 French Open and 2019 Wimbledon winner.
"I was leading the match. I was playing well. I lost it. I couldn't focus.
"After the match, it was pretty tough. But now I'm good. I'm recovered, and I will learn from this episode. Nothing dangerous. The doctors checked everything. Everything was perfect."
Zheng, just 19 and making her Paris debut, triumphed 2-6, 6-2, 6-1 and will face either 2017 champion Jelena Ostapenko or France's Alize Cornet for a place in the last 16.