Mariners in awe of their Yankees, Mets trade hauls: ‘Eye-opener’

Within their offseason teardown, the Mariners’ two biggest trades were with the Mets (Robinson Cano and Edwin Diaz) and the Yankees. The four main prospects Seattle received — Justin Dunn and Jarred Kelenic from the Mets and Justus Sheffield and Erik Swanson from the Yankees — have been sent to the minors, but left a…