He pitched for the Chicago White Sox (1990–96) and Florida Marlins (1997, 1999–2000) in his 11-year Major League Baseball career.

After pitching the entire regular season for the Marlins, Fernandez was on the 1997 postseason roster for the NLDS and NLCS.

He previously played at the University of Miami before transferring to MDCC to be eligible to enter the Baseball Major League Draft.

Going on a different path after retiring from baseball, Fernandez is involved in radio and becoming active in politics in his hometown of Miami Beach, where he campaigned for and helped elect its mayor.

He is the former director of baseball operations at Archbishop McCarthy High School in Southwest Ranches, Florida.