The 34-year-old Martinez is in the midst of his third season as a member of the Cleveland organization, which briefly separated from in 2016 by way of a July trade with Boston. Martinez ended up returning to the Indians via waivers in August, and he went on to make the final out in the club’s Game 7 World Series loss to the Cubs. While Martinez is versatile in the field, having appeared at six defensive positions in his career (he even pitched earlier this season), he has been an especially poor offensive player in the majors. Martinez owns a .200/.246/.270 line in 592 plate appearances, though he has performed well in an extremely small sample this year (.364/.462/.455 in 14 PAs).
Robertson, 31, made his major league debut with the Rangers in 2014 and has also seen action with the Angels and Mariners, hitting .273/.322/.325 with no home runs in 298 PAs. He has been far more successful at the Triple-A level, having slashed .290/.365/.393 in 1,929 trips to the plate.