Casey and his wife, Jocelyn, are giving $100,000 to a charity through the Houston Golf Association, which runs the event. He will work with tournament director Steve Timms to figure out which charity gets the money.
Casey, a runner-up at the Match Play Championship on Sunday in Arizona, flew to Houston to make the announcement and meet with the media about his title defense. He won last year in a playoff over J.B. Holmes.
The Houston Open is April 1-4.