Sandy Alcantara is the perfect example of why you can’t judge a Pitcher solely on their record.

As of this writing, Alcantara has been with the Marlins for four years after being traded from St. Louis, where he played in only eight Games.  Alcantara mainly played in the Minors but became a permanent starter the year after.  It was bittersweet for Alcantara, who became Miami's best hurler, but due to a lack of run support, he led the NL in Losses (14).  He had a good 2020 (3-2 3.00 ERA) but again had a poor record (9-15) in 2021 though he had a nice ERA of 3.19.

Alcantara won the Cy Young in 2022, making him the first Marling to do so.  He also went to his second All-Star, and had a 14-9 Record with a 2.28 ERA and 0.998 WHIP.  He did not follow that with another Cy Young caliber year (7-12, 4.14 ERA, 151 SO), but he missed the entire 2024 Season recovering from Tommy John Suregery.

If he returns healthy and becomes one of the few players who stays in Miami for a long time, he could reach the top of this list.

Robb Nen played nine Games for the Texas Rangers before being traded to the Marlins in their expansion year.  

Nen was not very good the rest of the year, as his ERA was 7.01, but he got significantly better, and would be promoted to the team's closer during the following season.  In 1995, Nen had an abysmal 0-7 record, but had a respectable 3.29 ERA, with 23 Saves.  His best year in Florida came after, with 35 Saves and a 1.95 ERA, and though his ERA went back up over three in 1997, he equaled his 35 Saves from the year before.  The Marlins went to the postseason, and Nen had four Saves in the Playoffs, and the Marlins won it all, but that was the end for him in Florida.

Following the World Series win, Nen was one of the many players traded, with San Francisco being his destination.  He Saved 108 Games as a Marlin.

A.J. Ramos was a late round selection (21^st) in 2009, and the Texan Pitcher was a Miami Marlin for the first five years and change of his career.

Ramos was never a starter, and he began his MLB career in middle relief, which included a 7-0 season in 2014 where he had a 2.11 ERA over 68 Games.  He did so well that year that the Marlins promoted him to be their closer, and he shut the door with 32 Saves in 2015 and 40 Saves in 2016.  Ramos was especially good that year, going to the All-Star Game and posting career-highs in Saves.  

The Marlins did what they always did during the 2017 Season and traded him when his contact would eventually become due.  Ramos would finish 175 Games for Miami and Save 92.

Cody Ross had played briefly for Detroit, Los Angeles (NL), and was with Cincinnati for a pair of Games before his contract was sold to the Florida Marlins, where he would have an opportunity to play more.

Ross appeared in 157 Games from 2006 to 2007 but was elevated to a starting role in the Outfield and had back-to-back 20 Home Run Seasons in 2009 and 2009, with respectable Batting Averages of .260 and .270, respectively.

During the Marlins' cost-cutting, he was placed on waivers and was claimed by the San Francisco Giants.  The Giants went on to win the World Series that year, with Ross winning the NLCS MVP.  As a Marlin, Ross had 80 Home Runs with 503 Hits.