Venezuela's Karen Marcano defeated Colombia's Clara Guerrero to win the Masters gold medal at the 2010 Pan American Bowling Confederation Women's Championships in suburban Las Vegas on Friday, the United States Bowling Congress reported. Marcano, a 31-year-old righty, cut open her hand on a broken thumb slug but was able to patch it up and bowl through the pain for a 2-1 victory over Guerrero, USBC reported....