The D'backs have issues in the infield right now, with shortstops Chris Owings and Nick Ahmed currently sidelined due to injury and Ketel Marte on the bereavement list. The 34-year-old Rosales is a decent short-term addition who can provide the necessary depth down the stretch.

In Mejia, the Athletics land a 22-year-old right-hander with a bright future as a reliever. He is tall and lanky (6-7), and can strike batters out. He does have control and command issues, though, so he will need more development time. Still, he is a good addition in return for a journeyman infielder.

Rosales will not play enough to make a major impact with Arizona, while Mejia is not quite ready to be a fantasy factor. That may come with time, though.