2:57pm: The Mets will designate lefty Ryan O’Rourke for assignment to open up space for Mazza, Deesha Thosar of the New York Daily News tweets. The 31-year-old O’Rourke signed a minor league contract with the Mets in the offseason. He threw 1 1/3 innings with the Mets earlier this year, and has mostly spent the season at the Triple-A level. O’Rourke has registered a 3.31 ERA/4.44 FIP with 9.09 K/9, 4.68 BB/9 and a 52.3 percent grounder rate in 32 2/3 innings with Syracuse.
The 29-year-old Mazza will work out of the Mets’ bullpen when they promote him, per DiComo. Mazza hasn’t yet taken a major league mound since entering the pro ranks as a 27th-round pick of the Twins in 2011. He ascended to the Triple-A level for the first time last year as a member of the Marlins and has primarily pitched there this season with the Mets’ top affiliate.
Mazza has worked to a 3.67 ERA/4.06 FIP with 8.08 K/9 and 2.2 BB/9 in 49 innings at Syracuse this season. Overall, he owns a 3.74 Triple-A ERA with 8.0 K/9 and 2.8 BB/9 across 65 frames.