Jeurys Familia tied the Mets' single-season saves record with his 43rd save of the year in Sunday's 1-0 win over the Nationals.
Familia pitched a scoreless ninth inning, working around Bryce Harper's two-out double, to tie Armando Benitez's single-season record set in 2001.
"He stepped up and did a tremendous job all year," manager Terry Collins said.
In Familia's first season as closer, he converted 43 of 48 opportunities and ended the year with a 1.85 ERA. He struck out 86 batters in 78 innings.
"He had an unbelievable season," Travis d'Arnaud said.
Familia took over the closer role after Jenrry Mejia was suspended 80 games for a failed drug test.
"He was thrown into that closer's role and he never looked back," David Wright said. "He's about as dominant as any arm in baseball, so he's proven that he's an All-Star caliber closer and you just feel confident when you can shorten the game up, and he definitely shortens up the game for us."
After surrendering a three-run home run in a blown save on July 30, Familia converted 16 consecutive saves and has given up four runs in his last 28 1/3 innings, three of which coming in a loss on Sept. 23.
"He bounced back after that, had another rough start, and then ran off a string where he was unhittable," Collins said. "So that showed me that mentally he's fine."