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Unbreakable because...

That Dodgers' season was extended beyond the usual 162-game schedule by a best-of-three tiebreaker series. Those ties are settled by playing a single game under current MLB rules.

Unbreakable because...

Not only did the Dodgers get Greinke's prime years without any of the early-career growing pains, he elected to leave before the regression hit. The right-hander opted out of his contract and joined the Arizona Diamondbacks the following season for an industry-leading salary.

Unbreakable because...

Marshall was a physiological freak playing in an era when there was less regard for player safety than we see today. 

Unbreakable because...

This was a similar case to Marshall's record—a unique athlete allowed to operate without the constraints of today's game. But also, Koufax's heavy usage tragically forced him to retire in his early 30's, so his career is viewed as a cautionary tale that you wouldn't want to try and emulate.

Unbreakable because...

Kershaw doubled his own existing franchise record from 2014. He's the best pitcher of his generation, coming around at a time when strikeouts have never been more prevalent.

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