Random Riddle: 2-29-2016 - Common Sense Evaluation

I may run rings around you
Or escape your clutching grip
Or leave a treacherous trail
That gives a sudden slip.
(If you’re not careful!)

You always end up winning,
While I shrink with each new meet:
Our bouts will be my ruin,
But you’ll come out smelling sweet.

What am I?

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