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Unbreakable because...

No Red Sox player has even cracked 30 since Rice. Balls put in play are at an all-time low in Major League Baseball, with batters more willing to strike out in critical at-bats than potentially cost their team two outs with a poorly placed grounder.

Unbreakable because...

Pedro's seven seasons in Boston were arguably the seven best seasons of his first-ballot Hall of Fame career. The Red Sox would need impeccable timing and a great lineup for offensive support to put another pitcher in the position to challenge this.

Unbreakable because...

Velocity readings only became thorough and official during the 2002 season, at which point Wakefield had already lost some life on his notoriously weak fastball. Since then, baseball prospects have been encouraged to throw harder than ever.

Unbreakable because...

Williams may have been the most disciplined batter ever. His incredible vision, plus his long tenure with the franchise and ability to punish mistakes in the strike zone (521 career home runs) disincentivized pitchers to challenge him.

Unbreakable because...

Modern free agency rules make it exceedingly rare to retain players for their entire careers, especially those who continue into their 40's. Yaz's durability was unique in Red Sox history.

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