Players Association president Derek Fisher, center, spoke after a meeting of the players' union in New York on Monday. [Source: Sina.com]

8. In the summer of 2011, several professional sports leagues, including NFL, NBA, La Liga, Serie A, suffered lockout or postpone as owners and players disagreed on terms of a new collective bargaining agreement.

Following NFL, NBA's lockout started from July 1 upon the expiration of the 2005 collective bargaining agreement, and it was ended on December 8 after owners and players reached a new deal, including a 66-game regular season, with games commencing on December 25.

La Liga and Serie A were also forced to postpone their opening round because the disagreement between owners and players on new terms, but the second round began on time after new agreements were reached.