It was the fourth win of the season for the 24-year-old European Tour rookie and lifted him into third place in this year's Race to Dubai.
He is now only €730,000 (£590,000) behind leader Rory McIlroy and, as he accepted his €617,000 winner's cheque, Grace said he was now focused on beating the world No 1 to the top honour in European golf.
"First place is definitely in my sights," Grace said.
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