In Rio, Caroline Wozniacki went ham trading pins with her fellow elite athletes. The Dane's credential lanyard looked too heavy to wear by trip's end. Woznaicki wasn't the only WTA star with a mad love for pins.

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The pros were taking the pin culture very seriously.

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It wasn't just the ladies, Dustin Brown got in on the action too.

The tradition is a hot topic even among Olympic veterans.

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And it gets competitive (as expected).

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At the end of the day, the pins are an excuse to meet athletes from other sports, and a simple way for Olympians to take home a piece of Rio.

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