Gatlin hopeful for 2012 Olympics ahead of comeback

Returning from a four-year doping ban, Justin Gatlin says he'll be running for his fans, friends and infant son.

A day before the track meet in Estonia, the 28-year-old American sprinter said Monday he wants "to go out there and be able to show my son that I'm a good athlete."

Gatlin won gold in the 100 meters at the 2004 Athens Olympics and in the 100 and 200 at the 2005 world championships. He tested positive in April 2006 for excessive testosterone.

He will be competing in the 100 on Tuesday at a small meet in Rakvere, northeastern Estonia.

Gatlin expects to compete in the Olympics in two years, saying "I think of myself as a championship athlete ... "I can't wait for London 2012."