Discuss: What do the numbers really say about J.D. Martinez’s defense?

How evolving metrics paint a more complete picture of Martinez’s defensive ability.

(Barry Chin/Globe Staff)

For Red Sox outfielder/designated hitter J.D. Martinez, his free agency this offseason represented something a bit different. His trip to the open market also came with an unexpected degree of scrutiny, and criticism focused on Martinez’s defensive résumé. “I got to hear how terrible I am,” Martinez said. “I don’t get it. It blows my mind.”

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