A swing flaw ruined J.D. Martinez in 2020. Here's how he sought to correct it

alex speier A swing flaw ruined J.D. Martinez in 2020. Here’s how he sought to correct it In the final days of the 2020 season, J.D. Martinez made no attempt to mask his horrendous disappointment. A self-made player who’d become one of the most consistent middle-of-the-order producers in baseball from 2014-19 saw his offensive numbers plummet and his swing fall apart.

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