can any 1 tell me who is richest sports person and who is ahead in commercial?

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well were i can heared that richest sports person in the world is of lawn tennis but were my knowledge ends it tells me that the richest is Tigerwoods of golf is it true well if i know by you then i must be confindent and who takes maximum money in making and commercial ads in various fields so please let me know the right knowledge i m waiting for your all reply