Three more perfect games were rolled at the 2010 United States Bowling Congress Open Championships Thursday and Friday, USBC reported. Ken Konczos of Sagamore Hills, Ohio, rolled the 11th 300 of the year in his final game of singles Thursday night, while Matthew Randall of Allen Park, Mich., tossed the 12th in his last game of doubles Friday afternoon, and Rodney Machacek of Lincoln, Neb., followed suit three games later to make it a baker's dozen....