The third-seeded Ferrero was trailing Swiss qualifier Michael Lammer 3-1 in the first set when he turned his right ankle while attempting a backhand shot. The injury may jeopardize his plans to play in the Australian Open.
He received courtside treatment from a trainer and played only one point before retiring.
Story continues below ↓advertisement | your ad hereThe 209th-ranked Lammer advanced to the quarterfinals.
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