Former world champion Justin Gatlin said Wednesday he feels \"blessed\" to be back on the track here and doing what he loves. The American sprinter this month will be making his first appearance at the World Championships in Athletics since his four-year doping ban ended last year. He placed second behind Walter Dix at the U.S. national championships in June. Gatlin won the men\'s 100-meter titles at the 2004 Athens Olympics and the 2005 world championships in Helsinki. But a positive doping test in 2006 kept him off the track for four years, and Gatlin said he\'s just glad to be back.