Can you solve this riddle?

The answer to this riddle has a hole in the middle and some have been known to fall in it.
In tennis it's nothing but it can be received,
And sometimes a person may win it.
Not meant to be bought but it may yet be perceived,
Like princes and news it's in clover.
The answer to this riddle has a hole in the middle,
And without it one cannot start over.

What am I?

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