[2] In May 1986, Oliveras took over as skipper of the independent Miami Marlins after Fred Hatfield was fired.

He had been "widely praised for his work in the Puerto Rican Winter League", according to Baseball America's 1987 Statistics Report, and the Marlins won the most games they had in eight years.

He took over as skipper of the Orlando Rays in 2002, then moved down to the Charleston RiverDogs in 2003, and then back up to the Bakersfield Blaze in 2004.

[5] In December 2009, Oliveras was hired by the Diablos Rojos del México as the team's new manager.

[6][7] He coached the Indios de Mayagüez to win the 2022-2023 Puerto Rican Winter League.