If the Seattle Mariners are going to make a big trade this offseason, there’s now one indication of who it could be with.
MLB Network insider Jon Morosi reported Wednesday that per a source, the Boston Red Sox “are working to acquire one of the Mariners’ starting pitchers.” That comes on the heels of the Red Sox making a blockbuster deal with the White Sox for All-Star pitcher Garrett Crochet earlier Wednesday.
Seattle Times Mariners reporter Adam Jude had his own report shortly after, posting on social media that “Boston has been persistent in its pursuit of one Seattle’s starters.” He added that a hypothetical deal that would send Mariners pitcher Luis Castillo to the Red Sox for first baseman Triston Casas would “seem to make sense for both sides.”…