Surprised no one has mentioned Messi yet, although he is another who is more a sportsman than an athlete, however he does deserve to be here. Very fast and incredibly strong for a bloke his size (the way he can go through defenders much bigger than him is incredible) and he is also extremely agile and leaves blokes for dead left right and centre.
One things the basketballers do have in their favour over most football codes is in basketball there is next to no stoppages and the game is very fast, apart from time outs and free throws the longest stoppage you will get in a quarter is 5 seconds max. No like the rugby codes where the ball goes out and you can wait a minute to get it back in again, or have a 2-3 minute stoppage after a try. When I started playing indoor soccer (which is similar, apart from goals there is no stoppages), that was one of the first things I realised about how tough the game was.