France's Gilles Simon returns the ball to Jack Sock from US during their match at the Italian Open tennis tournament, in Rome, Monday, May 11, 2015. (AP Photo/Felice Calabro')
Felice Calabro'
May 20, 2015

NICE, France (AP) Top-seeded Gilles Simon of France withdrew from the Open de Nice on Wednesday, casting doubts on his French Open participation.

Simon, who retired from his second-round match in Madrid this month, says ''I'm extremely sorry to withdraw from the Nice Open. The pain is too strong.''

The French Open starts on Sunday.

The 13th-ranked Simon was set to face James Duckworth of Australia for a quarterfinal spot and will be replaced by French lucky loser Quentin Halys.

Fourth-seeded Leonardo Mayer advanced to the last-eight with a 6-4, 6-0 win over French wild-card entry Lucas Pouille to set up a meeting against Juan Monaco.

Dominic Thiem also progressed when sixth-seeded Nick Kyrgios retired while trailing 4-3 in the first set.

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