@ehBeth,
One thing I think that great athletes have is drive and ambition - they also have to work hard. It is a personality sort of thing - competition and doing well - that at least in my opinion is why you see many athletes also being successful in academics - not all of course, but many use that same ambition with academics.
Some sports don't reap the same financial rewards with endorsements and so forth as well even those winning gold medals.
A big thing my daughter has learned with her demanding practices and weekend tournament schedules is how to plan. We expect her to still get good grades - if she doesn't then she wouldn't be able to play (we wouldn't let her). So she needs to plan to complete her homework and studying and still make practices.
She learned this early on - one time she "forgot" about a project and left it to the last minute. She had practice that night - we sent an email to her coach explaining the situation and that school came first. We also said, we expect since she missed practice that she does not start that weekend - she never did that again.