The Mets have called up LH reliever Sean Gilmartin and optioned INF TJ Rivera to Triple-A Las Vegas.
During their 16-inning win over the Marlins on Thursday night, the Mets used every one of their relievers.
With the move, the Mets now have a four-man bench and eight relievers.
Gilmartin, 26, has an 8.10 ERA and 1.50 WHIP in 3 1/3 innings this season for Las Vegas.
Rivera, 28, has walked twice and struck out three times in five plate appearances for the Mets this season.