Magneuris Sierra, collected by the Miami Marlins in the deal with the St. Louis Cardinals for Marcell Ozuna in the lead to the 2018 campaign, hit .190/.222/.211 in 54 games. He stole three bases in five tries, and the consensus opinion was that he would probably do well with a little more time in the minors.
Yadiel Rivera was a free agent signee from the Milwaukee Brewers, and played in 111 games for the Miami Marlins. His batting line was just .173/.269/.216 – but his unquestionably above-average defensive capabilities kept him on the parent club.