An American and a Russian athlete walked away with gold medals at the World Athletics championships Saturday in Edmonton, Canada. The United States took home its first gold medal of the championships, and the world's fastest man showed all challengers he is ready to take them on.

It was a day of varied action here at the World Athletics Championships in Edmonton, Alberta, Canada, where American John Godina won his third world title by taking the men's shot put. Godina needed only one throw in the shot put to win, with a distance of 21m 87. The American says winning his third title is extremely satisfying. "This one's the best," he said. " It's definitely the top one, just because of the hard time I had last year and towards the end of the year before. It's just great to come back and be on top again."

American Adam Nelson finished second, and the bronze medal went to Olympic champion Arsi Harju of Finland.

In the men's 20-kilometer walk, Roman Rasskazov led a Russian sweep of the top three places, with a time of 1:20:31. Former champion Ilya Markov took the silver medal, and Viktor Burayev of Russia won the bronze.

World and Olympic champion Maurice Greene of the United States, easily qualified for the semifinals of the men's 100-meters, finishing his heat with the day's best time of :09.98. Greene says he is eager to challenge the best sprinters in the world, including Canada's Donovan Bailey. "I mean, he's at home, so what more of a chance do you need? You are able to get up for anything when you are in your back yard," he said.

U.S. Champion Tim Montgomery, Dwain Chambers of Britain, Obadele Thompson of Barbados, Ato Boldon of Trinidad and Canadian Bruny Surin also qualified.