As per law in many states, at least 10% should be paid at the counter when you recieve your payment.
Eventhough, payment being made toward winning amount, this is not the end of it. We must know that all of these amounts must be added to your income when filing your tax return. Also, it depends on if your income goes up becuase of the winning scratch, this will play major role to increase your tax. The tax you paid when winning is not final, it is nothing but withholding tax.
If you are single and earned nothing, you should pay 10% of that amount at least.