/teamtitleist/ca/b/weblog/posts/chris-kirk-trusts-pro-v1x-new-prototype-titleist-irons-to-first-pga-tour-victory Tied for the lead in the 17th fairway Sunday at the Viking Classic, Titleist Brand Ambassador Chris Kirk stood over his Titleist Pro V1x golf ball with a new Prototype Titleist CB (712 Series) 9-iron waggling in his hands. Kirk knew the distance wasen-USTelligent Community 10