Guerrero, the nephew of former MLB superstar Vladimir Guerrero, was acquired from the Mariners in the 2015 trade that sent Mark Trumbo from Arizona to Seattle. Though he long rated as one of the top prospects in the Mariners organization, Guerrero’s performance stalled in 2015-16. He hit just .223/.258/.346 between his two organizations’ Double-A affiliates in 2015 and struggled similarly this year, hitting .234/.281/.383 between Double-A and Triple-A.
Leyba, meanwhile, went from the Tigers to the D-backs in the three-team trade that sent Didi Gregorius to the Yankees, Shane Greene to Detroit and Leyba and Robbie Ray to Arizona. The middle infielder hit .296/.355/.429 between Class-A Advanced and Double-A as a 20-year-old this past season. He played primarily shortstop this season, though there’s been some question in past scouting reports about his ability to stay there, with some opining that Leyba is best suited for second base.