Sport's Three Biggest Current Rivalries

Sudip Bagui@sooo_deepCorrespondent IJuly 9, 2009

Sport's Three Biggest Current Rivalries

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    BARCELONA, SPAIN - APRIL 23:  Cristiano Ronaldo (R) of Manchester United holds off the challenge of Lionel Messi (L) of Barcelona during the UEFA Champions League Semi-Final, first leg match between Barcelona and Manchester United at the Camp Nou stadium

Roger Federer vs. Rafael Nadal

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    MADRID, SPAIN - MAY 17:  Roger Federer of Switzerland (R) and Rafael Nadal of Spain during the prize giving ceremony after the mens final during the Madrid Open tennis tournament at the Caja Magica on May 17, 2009 in Madrid, Spain.  (Photo by Clive Brunsk

Kobe Bryant vs. LeBron James

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    LOS ANGELES, CA - JANUARY 19:  Kobe Bryant #24 of the Los Angeles Lakers walks next to LeBron James #23 of the Cleveland Cavaliers during a break from the game at Staples Center on January 19, 2009 in Los Angeles, California.  (Photo by Harry How/Getty Im

Cristiano Ronaldo vs. Lionel Messi vs. Kaka

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    ZURICH, SWITZERLAND - DECEMBER 17:  (L-R) Kaka of AC Milan and Brazil winner of World Player,Cristiano Ronaldo third placed, of Manchester United and Portugal and Lionel Messi runner up of Barcelona and Argentina pose with their awards during the FIFA Wor