Miami Marlins: The Five most disappointing Marlins of 2015

May 13, 2015; Los Angeles, CA, USA; Miami Marlins starter Jarred Cosart delivers a pitch against the Los Angeles Dodgers at Dodger Stadium. Mandatory Credit: Kirby Lee-USA TODAY Sports

Number 4: Jarred Cosart

Miami was looking for Jarred Cosart to play a key role in their rotation for 2015. Instead, Cosart has been battling vertigo and is likely to return to healthy form just for the final month of the season.

In his starts with the Marlins, Cosart has pitched to a 1-4 record, owning a 5.36 ERA and a negative war (-0.3). He hasn’t fared any better during his stints in New Orleans, where he holds a 6.02 ERA in 16.1 IP.

While Cosart may become productive later in the season, he has been one of the Marlins’ biggest disappointments up to this point.