Let's just run down a few key acquisitions made by the Red Sox that had some dealings with the Seattle Mariners.
July 31, 1997: Seattle Mariners trade Derek Lowe and Jason Varitek to the Boston Red Sox for Heathcliff Slocumb.
August 6, 2003: Boston Red Sox pick Mike Myers up off waivers from Seattle Mariners
February 20, 2013: Boston Red Sox purchase Mike Carp from Seattle Mariners
Lowe and Varitek undoubtedly helped the Red Sox win the 2004 World Series. Mike Myers and Mike Carp were more bit players, but I will consider them as additional gifts from the Seattle Mariners.
Sure, the Red Sox sent Jamie Moyer to Seattle in return for Darren Bragg, but the Mariners didn't win a World Series with Jamie Moyer, so arguably the Red Sox have made it out on top of the trade history between the two teams.
Today's a short post, but that's the way it goes!