Coria, fifth in the ATP rankings, has injured a shoulder while former world number one Ferrero pulled out of next week's 2.425 million dollar event with illness.
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Tournament director Alain Riou said on Thursday that the organisers of Masters Series tournaments were "very concerned" with the growing number of top players missing their events.
Federer's withdrawal, however, had been expected after a thigh injury forced him out of the Madrid Masters and the Swiss Indoors event, currently underway in Basel.
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