For the Pirates, it would make sense to trade Keller.

Despite their need for starting pitching depth heading into the stretch run, the Boston Red Sox recently rejected an offer from the San Diego Padres for a deal involving Jarren Duran and Dylan Cease.

As chief baseball officer Craig Breslow scours the pitching market, Zachary D. Rymer of Bleacher Report predicts the Red Sox make a trade for Washington Nationals’ ace MacKenzie Gore.