Sean Gilmartin had a great 2015 season for the Mets after being picked in the Rule 5 draft and sticking with the Mets all season. He was a reliable long reliever who had a 2.67 ERA and 143 ERA+ over 50 appearances in his rookie campaign. He looked poised to build on that in 2016, but he got buried on the depth chart and performed unspectacularly—with a 7.32 ERA in 17.2 innings—when he did pitch for the Mets.
Gilmartin hasn’t turned any heads this spring, either, with a 6.75 ERA in just 6.2 innings and a shoulder issue that’s kept him sidelined for the past few weeks. He’ll face an uphill battle if he wants to pitch for the Mets in 2017 before rosters expand in September.
Last year, Gilmartin had a 4.86 ERA over 19 appearances at Las Vegas, all but one of which came as a starter, but the Pacific Coast League is notably quite hitter-friendly, and he did have above-average strikeout and walk rates.
Gilmartin would have to leapfrog a couple of people on the depth chart in order to get a crack at the big leagues again, but the Mets would presumably love to have the 2015 Gilmartin back on their roster if he can get back to that level of performance.