The Mets called up 29-year-old RHP Chris Mazza from Triple-A Syracuse before Wednesday's game against the Phillies.
Mazza has pitched in the minors since 2012, as he is 26-26 with a 3.19 ERA inn 151 games (59 starts).
"It's something you dream of as a kid, and to finally get here is an overwhelming excitement," Mazza said. "I'm just trying to take it one minute at a time."
Mazza was watching Tuesday's Mets-Phillies game on TV when he got the call.
"Trying to hold back tears as I'm trying to listen to instructions for what I've got to do," Mazza said. "It was pretty much a roller coaster. After that, just called my dad, kind of let it out a little bit. A lot of emotion."
This season, Mazza is 3-3 with a 3.67 ERA in eight starts with Syracuse. He gave up five earned runs and seven hits in his most recent outing last Friday, however on June 15 he threw eight scoreless innings.
A 27th-round pick of the Minnesota Twins in 2011, Mazza has been in the Twins, Marlins and Mariners' farm systems before the Mets claimed him off waivers in December.
The Mets optioned Walker Lockett to Triple-A and designated Ryan O'Rourke for assignment as corresponding 25-man and 40-man roster moves.