Ricky Nolasco might be one of the tenured Pitchers in Marlins history, though the fact that he was never a staff ace impacts his ranking, especially on a Top 50 list like this.

Nolasco toiled in the Cubs minor league system for four years before being traded to the Marlins before the 2006 Season.  In Miami, Nolasco immediately made the Marlins roster, going 11-11, despite an ERA near five.  Injured for most of the 2007 Season, Nolasco was back and, over the next five years, was an intriguing Pitcher, winning far more games than he lost, though his ERA was bloated due to the high amount of Hits he allowed.  Despite this, Nolasco did not walk many batters and had a Marlins SO/BB of 3.51, which is the highest in franchise history.  

Nolasco was dealt to the Dodgers during the 2013 Season, and as of this writing, he is the all-time leader in Wins (81), Innings Pitched (1,225.2), and Strikeouts.

The Marlins drafted J.T. Realmuto in the Third Round in 2010, and after four years in the minors, the Catcher made it to the main roster, playing 11 Games in 2014.  The Marlins knew that Realmuto was the Catcher moving forward, and he took over behind the plate in 2015.

Realmuto struggled as a rookie, with an OBP under .300, though his arm defensively was an asset.  He was much better in 2016, batting .303 and hitting at least .277 the next two years.  Realmuto's power numbers grew, belting 17 in 2017 with 21 in 2018.  He went to his first All-Star Game in 2018, and was also a Silver Slugger, and to date, it was the best of his career.  

Since this was the Marlins, you know what happened next.

As typical with Miami, they traded Realmuto away when they decided he no longer fit their budget, and his play elevated in Philadelphia, matching the higher salary he made as a Phillie.  Realmuto had 555 Hits with Philadelphia and batted .279.

From the Dominican Republic, Marcell Ozuna was signed in 2008, and five years later debuted for the Miami Marlins.

Ozuna became a fixture in Rightfield as a sophomore, peppering 23 Home Runs in 2014, a number he duplicated in 2016, which was his first All-Star season.  Ozuna followed that with a breakout campaign, blasting 37 Home Runs with 123 RBIs with a .312 Batting Average.  In addition to obtaining his second All-Star invitation, he won his first Gold Glove and Silver Slugger.  

As typical with the Marlins, Ozuna was traded before he could be priced out, with the Cardinals being his landing place. With Miami, Ozuna batted .277 with 96 Home Runs.

Cliff Floyd began his baseball career with the Montreal Expos, a team he played four years before being traded to the Florida Marlins in 1997.

Floyd played mostly off the bench in his first year in Florida, but he did help them win their first World Series Championship.  He became a starter in Leftfield in 1998, smacking 22 Home Runs, a total he matched again in 2000 when he batted an even .300.  Floyd had his best year in a Marlins uniform in 2001, going to the All-Star Game and hitting 31 Home Runs, 103 RBIs with a .317 Batting Average.   Floyd had come into his own, but he was traded in July the following year, returning to the Expos.

With the Marlins, Floyd batted .294 with 110 Home Runs.