When his contract expires usually after the world series.
1978. The first free agency game around because players wanted to be able to switch teams without the problems of coaches and other contracts.
Free agency began after the 1976 Collective bargaining agreement. http://www.sptimes.com/News/102299/Sports/Free_agency_era_opens.shtml http://www.usatoday.com/sports/comment/colbod.htm
The World Anti-Doping Agency is the agency that promotes 'drug free sport' at international sporting events. It is an independent body that promotes and monitors the fight against doping in all sports.
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Statistical Review of World Energy by BP
Plan B free agency happened in 1992.
Plan B free agency was created in 1989.
Free agency was 'invented' in MLB by a independent arbitrator in December, 1975.
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The Yankees acquired Hideki Matsui via free agency from the Yomiuri Giants in 2002 and signed him to a 3-year, $21 million contract. He played with them for seven seasons and was even named the World Series MVP in 2009
The Yankees have won seven World Series in the free agent era.1977, 1978, 1996, 1998, 1999, 2000, 2009