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^This blog compares greatness, from the point of view of ranking Tendulkar. He settles on Muhammad Ali in the end, but also provides a grounding for how he ranks greatness.
first component part of greatness is cold hard statistics.]
next component parts of greatness - longevity and consistency of performance.
competition and rivalry are also significant factors in greatness.
A better gauge of the greatness of team players is how they perform on the biggest stage
The true greats - the really, really, really great - transcend their sport, become almost god-like, and gods don't go to the supermarket for their shopping. Tendulkar, a legend in his own career, is on the top table, up there with Tiger and Jordan and Pele. Not the greatest, though - I'm with Mandela, that simply has to be Ali, the greatest great there has ever been and probably ever will be.
Tendulkar certainly is a fantastic cricket player, I can't really compare with Bradman as I know very little about Bradman, but Tendulkar ticks pretty much all the boxes. He's a hero to his nation, his first international match was at 16 against Pakistan in 1989. A bouncer hit his face, he was up against Waqar Younis (a highly rated bowler) and he still looked calm. He's been pretty much at the top since then.
He has the highest number of runs and centuries, and is miles ahead of his nearest competitor.
He's probably the most famous person in India, when India won the cricket world cup his teamates dedicated the win to him. He didn't win the game for them, nor was it his last game for India, but they still singled him out, and carried him on a lap of honour around the stadium. As they say, "if cricket is religion, then Sachin is God".