Baseball

You can catch all the actions of Major League Baseball here on its Official website
http://mlb.mlb.com/index.jsp
You can find the history and origin of Baseball here on
http://en.wikipedia.org/wiki/Baseball
You can find the history and stats about Baseball here on
http://www.baseball-almanac.com/

Basketball

You can catch all the actions of NBA national basketball association on its official website here
http://www.nba.com/
You can find here history and origin of Basketball game here on
http://en.wikipedia.org/wiki/Basketball

Olympic

Catch all actions of olympic on
http://www.olympic.org/
You can catch all the actions of 2008 Beijing Olympic on its official website
http://en.beijing2008.cn/
You can find all the information about players, medals and records here on
http://www.olympic.org/uk/games/torino/
You can find origin and history of olympic here on
http://en.wikipedia.org/wiki/Olympic_Games

Tennis

You can catch all the action of mens tennis on
http://www.atptennis.com/
and womens tennis on
http://www.sonyericssonwtatour.com/
Catch the history of Grand Slams of tennis and its origin here on
http://en.wikipedia.org/wiki/Grand_Slam_(tennis)
Catch all the related news and actions about Australian open here on
http://www.australianopen.com/en_AU/index.html
Catch all the related news and actions about French open here on
http://www.fft.fr/rolandgarros/default_en.asp
Catch all the related news and actions about Wimbledon here on
http://www.wimbledon.org/en_GB/index.html
Catch all the related news and actions about American open here on
http://www.usopen.org/en_US/index.html
Wants to know about Tennis legend Roger Federer just click on below here
http://www.rogerfederer.com/en/index.cfm

Cricket

All the rules and information about cricket you can find here on ICC's official website
http://www.icc-cricket.yahoo.com/
All the action of cricket you can find here on
http://www.cricinfo.com/
All the live action of cricket you can catch here on
http://www.content-ind.cricinfo.com/ci/engine/current/match/scores/live.html
Want to know about cricket and its origin, click on below link
http://www.en.wikipedia.org/wiki/Cricket
Wants to know about IPL(Indian Premier League)
http://www.indianpremeirleague.com/
Wants to know about Premier League cricket, click on below link
http://premierleaguecricket.in/

Football

All the football action is here on FIFA's official website
http://www.fifa.com/
You can find here history and origin of football
http://www.en.wikipedia.org/wiki/Football_(soccer)
You can find all the actions of English Premier League here on
http://www.premierleague.com/
You can catch all the actions of Spanish Primera La Liga here on in english site
http://www.soccer-spain.com/
You can catch all the actions of Italian Serie A and Serie B here on its Official website
http://www.lega-calcio.it/eng/index.shtml