Article Photos: PBR: Valdiron de Oliveira takes first at WinStar Casino Invitational in Chesapeake Arena 1/7

Ryan Dirteater rides White Velvet during the Winstar World Casino Invitational PBR event at the Chesapeake Energy Arena in Oklahoma City, Sunday, Feb. 12, 2012. Photo by Sarah Phipps, The Oklahoman