The best thing the Miami Marlins did in-season in 2019 was ink Miguel Rojas to a contract extension. With the departure of the uber-popular Martin Prado and changes set to be made for the upcoming 2020 season, having a veteran who leads by example in the clubhouse and works his tail off on the diamond is exactly what manager Don Mattingly needed to help solidify the batting order.
The Marlins are in Year 3 of this process of growth, where the minor leagues are filled with prospects and the 26-man roster is a diverse bunch of players, many of whom have come to South Florida via trade or free agency.