Guillermo Coria has the record of double faults this year, average of 12-20 per match. Last year he was top ten but now he is ranked 33° This week he had to retire in Sopot because shoulder pain. He lost to a WC player ranked 300 and something. Many people said his problems with the serviece are lack of cencentration, they are mental problems. Perhaps he needs to view a psichologist like Gaudio.