The United States was the most prize winning nation on the opening day of competition at the 2011 UCI BMX World Championships in Copenhagen, Denmark. Riders from ages five to 14 contested for the title of world's best across 17 challenge classes with the U.S. coming away with seven gold medals on Wednesday. The 8 and 9 year-old boys divisions got things rolling for the U.S. team with Americans taking gold and silver in both. Current USA Cycling BMX national champion Jack Kelly (Salt Lake City, Utah) scored the first world championship of the competition for the U.S. as he and silver-medalist Kohl Piluso (Chico, Calif.) nearly swept the 8 year-old boys podium. Last year's silver medalist in the 7 boys division Amakye Anderson (Tucson, Ariz.) and Preston Evans (Marietta, Ga.) also finished in the top five of the 8 boys main event. Of three Americans to enter the 9 boys division, Julian Dittrick (Phoenix, Ariz.), the reigning 8 boys world champ, and Andres Papajohn (Gardnerville, N.V.) went one-two.