Nearly every major national amateur baseball organization in America is united as a USA Baseball National Member Organization. As a result, USA Baseball governs more than 12 million amateur players in ballparks and playgrounds across the country.

As the commissioner's office for amateur baseball, USA Baseball is a resource center for its various membership groups, fans, and players. USA Baseball is also responsible for promoting and developing the game of baseball on the grassroots level, both nationally and internationally.

On the field in 2009 USA Baseball witnessed one of its most successful years ever. The World Baseball Classic Team, comprised of some of the best American players in Major League Baseball, kicked off the competition calendar for the organization, and it finished fourth, losing to eventual champion Japan in the semifinals in Los Angeles. USA Baseball fielded the World Cup Team -- its second professional squad of the year -- in September in Europe. Coming off a first place finish in the event in 2007, the team of All-Stars from Minor League Baseball did not disappoint, bringing home the country's second gold medal in the event in a row. The Collegiate National Team competed through a rigorous summer schedule, capping it with a title at the inaugural World Baseball Challenge in Canada. The 18U National Team made program history in Venezuela by winning its first ever COPABE "AAA"/18U Pan American Championships. In Taiwan, the 16U National Team took home the gold medal at the IBAF "AA"/16U World Youth Championships, and finishing the year on a high note, the 14U National Team pulled out a win in a close gold medal final for the COPABE "A"/14U Pan American Championships.