MIAMI -- To bolster the bullpen for a second-half run, the Marlins obtained lefty Arthur Rhodes from the Mariners at the July 31 Trade Deadline.

Based on an impressive season, Rhodes has improved his stock as he is about to explore the market. On Saturday, the left-hander who began his MLB career in 1991 filed for free agency.

Indications are that Rhodes likely will be moving on to another team.

Rhodes became the third Marlin to declare for free agency in as many days. Catcher Paul Lo Duca filed on Thursday and left-handed pitcher Mark Hendrickson completed the formality on Friday.

From the 2008 Marlins, veteran outfielder Luis Gonzalez has still to file. The Marlins are not expected to bring back Gonzalez either.

Rhodes, who turned 39 on Oct. 24, played an important role in the Marlins finishing with their first winning season since 2005. Assuming the role of late-innings lefty specialist, Rhodes appeared in 25 games with the Marlins, posting a 2-0 record with an 0.68 ERA. In 13 1/3 innings, he allowed one run while striking out 14 and walking three.

The Marlins obtained Rhodes from Seattle for right-handed pitching prospect Gaby Hernandez. Before the trade, he appeared in 36 games for the Mariners, posting a 2-1 record with a 2.86 ERA.

Rhodes has played for six teams as he prepares for his 17th MLB season.