The Seattle Mariners are reportedly finalizing a three-team trade that will see them acquire All-Star infielder Brendan Donovan from the St. Louis Cardinals. This deal, which also involves the Tampa Bay Rays, comes amidst significant trade buzz surrounding Donovan, who has been a target for various teams including the Red Sox. The Cardinals are expected to receive a promising return, including switch-pitcher Jurrangelo Cijntje and a first-round draft pick. As the Mariners strengthen their roster with Donovan, discussions continue about the potential implications of this trade in relation to other teams, particularly the Red Sox and Cubs.