Personally, I always do- with straws under it for support. BUT- all my flat cakes are a 2inch cake with another 2 inch cake on top with BC in the middle. So, anything I put on top of that I consider a 2nd tier. Especially if its not going all the way across (the exception is my present cake, which is 3 (three) 2inch cakes all filled and stacked, no extra boards)- I fiqure anything heavy on one side might start to break down that area with out support.
hi there, ive done a few belly cakes (same concept, sheet cake with soccerball on top, and ive never had to put a support, i just ice the bottom add the ball, ice that, and then add fondant, and ive never had problems with shifting or cracking hope this helps
baby
hi there, ive done a few belly cakes (same concept, sheet cake with soccerball on top, and ive never had to put a support, i just ice the bottom add the ball, ice that, and then add fondant, and ive never had problems with shifting or cracking hope this helps
baby
But if she's using both halves of the ball, she'll need the support. One half, as with a belly cake, you can go without. 
The total weight is pretty hefty.
sorry i though she did say shes using half the soccer ball...maybe i read it wrong
You're absolutely right, I read it wrong! lol Then no, she probably won't need the support under if she's doing half the ball. 
Sorry! 
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