After serving as the primary setup man to Mariano Rivera for a few seasons, David Robertson took over as closer with the New York Yankees in 2014. While no one can actually fill the shoes of the all-time MLB saves leader and future Hall of Famer, Robertson transitioned seamlessly to the role by converting 39 of his 44 save opportunities while posting a 3.08 ERA and a staggering 13.4 K/9 ratio in 64 innings of work.
He enters free agency as the only Proven Closer™ on the market after declining the Yankees' qualifying offer of one year at $15.3 million. The Yankees may have outbid other teams in order to keep his services in the Bronx. Fangraphs projects that Robertson will sign a three-year, $30 million deal, but Robertson is aiming higher, and would like to earn "Papelbon money," which is a reference to the four-year, $52 million contract given by the Phillies to closer Jonathan Papelbon in 2011. If Robertson walks away from the Yankees, they could turn to impressive flamethrower Dellin Betances to take over the closer role.
The Mets already have Jenrry Mejia and Bobby Parnell as their top closer options, with Jeurys Familia an excellent alternative as well. Mejia converted 28 of 31 save chances in 2014 as the Mets' primary closer. Parnell, who missed all but one game in 2014 after undergoing Tommy John surgery in April, converted 22 of 26 save chances in 2013 in the closer role.