In a post to Mets by the Numbers, Jon Springer writes:
“Perhaps giving into fan indignation and recognizing Keith Hernandez’s growing legend for his post-career contributions to the cause of Met-ness, No. 17 was unissued in 2011. It was the first time in 21 years no Met had worn 17. … Is it permanent? Or just taking a well-deserved break?”
The last player to where 17, according to Springer, was Fernando Tatis on July 4, 2010.
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To see the list of 15 players who wore No. 17 between 2010 and the time Hernandez left the Mets, check out Springer’s post on MBNT.