I think it is very hard to get in but you can do it if you are super motivated, have the right background, and are lucky. I know from my class someone is going to the Cubs and someone is going to the NBA for the summer. Off the top of my head Kellogg alums in pro-sports, CEO of the Bears, VP of the NFL, VP/assistant GM of the White Sox, some MLB big wig, a kid a few years ago ended up at the Indians, a few high ups in the NBA and the NHL. I am a diehard sports fan but it has to be one of the toughest places in the world to break into. Very few people do it, and I think very few do it straight out of school.
I think with the NFL, Kellogg has great brand awareness because they run a bunch of programs tailored to the athletes. They do mini-mba's for the league. Heck, Eddie George is actually an EMBA here. I would say top schools might get you noticed but if you really want sports, you are probably better off in law school...unless you want marketing or something like that.