India, Aug. 4 -- The Boston Red Sox remained active right up until the trade deadline, and one of their biggest surprises came less than an hour before the cutoff.

According to The Athletic's Ken Rosenthal, Boston is nearing a deal to send infielder Marcelo Mayer to the San Francisco Giants.

"Giants closer to acquiring Marcelo Mayer from Red Sox for reliever Erik Miller, sources tell me and Andrew Baggarly," Rosenthal reported.

In return, the Red Sox are expected to acquire reliever Erik Miller. The move marks a significant shift for Boston, with Mayer-once regarded as one of the organization's top prospects-reportedly on his way to San Francisco.

The trade represents a significant decision for Boston, which is parting ways with a you...