Del Potro retired Thursday against Borna Coric at the Shanghai Masters after injuring his knee. Third-seeded Del Potro fell near the end of the first set. The U.S. Open finalist had the knee wrapped but called it quits after losing the first set 7-5.

Tests on Saturday showed the fracture, Del Potro’s spokesman Jorge Viale tweeted Sunday.

“In the coming days, the doctors will evaluate the recovery process needed to return,” Viale said.

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