Gatlin, the 2004 Olympic champion and 2012 Olympic bronze medalist, was better than Usain Bolt, the six-time Olympic champion, in the early going, no surprise.
But Bolt took control around 50 meters and ran hard through the finish for the clear win. He and Gatlin, who have traded words in the media, shook hands after.
Bolt, won in 9.77 seconds with a slight headwind, his slowest time ever in a major championship final but his fastest time this year. Gatlin, took silver in 9.85 seconds. Jamaican Nesta Carter earned bronze in 9.95 seconds
Usain Bolt weathered steady rain and Justin Gatlin to take back the world title in the 100 meters on Sunday, crossing the finish as lightning reportedly struck in Moscow.