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Unbreakable because...

During the 2017 season, the average number of doubles per game have hit a 25-year low, as more players are adjusting their approaches to hit home runs (at the risk of getting out). Also, Musial had to play more than 3,000 games—all of them with the Cardinals—to set this record.

Unbreakable because...

Smith was a transcendent fielder who continued to earn consistent playing time into his early 40's without ever becoming a defensive liability (as older players almost always do).

Unbreakable because...

McGwire is an admitted steroid user who uncharacteristically experienced his greatest power-hitting seasons at a stage of his career when players typically decline. That's also why many of Barry Bonds' San Francisco Giants records are safe for the foreseeable future.

Unbreakable because...

Gibson (along with pitchers from other teams) dominated so thoroughly in 1968 that Major League Baseball actually lowered the pitching mound to give batters a fighting chance. That regulation remains in place today.

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