Marcelo Mayer had asked the Red Sox to trade him

This summer, the Red Sox traded Marcelo Mayer to the San Francisco Giants in exchange for left-handed reliever Erik Miller and minor league outfielder Carlos Gutierrez.
At the time, this came as a bit of a surprise to the baseball world, and now we're learning a little more about the 23-year-old's departure, courtesy of Susan Slusser of the San Francisco Chronicle.
Slusser reported that Mayer and his family had informed Red Sox management that they would be “comfortable” with a trade