Can sporting rivals be friends?

Rory McIlroy and Tiger Woods, Novak Djokovic and Andy Murray, Sebastian Vettel and Fernando Alonso -- this year has witnessed the evolution of some classic rivalries that bode for an intriguing 2013 sporting calendar.

Source: http://edition.cnn.com/2012/12/06/sport/golf/tiger-woods-mcilroy-rivals-golf/index.html?eref=edition

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