This is actually what I have been working on when I am bored.
I have all events and such laid out for the sports it's just the getting such items as the soccer ball, basketball, sandman I havent tried yet.
But anyway, I can't tell, are you requesting ideas so that you would make them, ie you could model and script a basketball, or is it just builds?
The only problem with the sandman in baseball is that you'd need for the ball to be picked up again, which is why I thought up not using it. Here is my plan for the simple hitting off.
Person up at bat has a wall of say 3x3 1x1 bricks. When the ball is thrown at one of the batter's blocks like the D-angry ball, the batter then selects one of the bricks, which it will reappear, and if the batter selected the correct brick, the ball bounces back to the pitcher. The only problem is that it can't be picked up again.
Expan on that would ya, I'm away from any possibility of blockland for a week.
I also have evented a fully functioning basketball court with scoreboard and all. I am currently working on the more zonular sports such as soccer an football.