The Mets designated Pat Misch for assignment to create roster space for Dale Thayer, according to Adam Rubin of ESPNNewYork.com (on Twitter). In related moves, the Mets optioned Fernando Martinez to the minor leagues and promoted Thayer.
Misch, 29, made six relief appearances this year and has allowed 11 hits and four walks in 7 innings, striking out five. The left-hander has a 4.80 ERA with 5.2 K/9 and 2.6 BB/9 in six seasons with the Giants and Mets.
Thayer, a right-hander who had brief stints with the Rays in 2009-10, has been pitching for the Mets' Triple-A affiliate. He has a 2.05 ERA with 8.5 K/9 and 2.1 BB/9 in 26 1/3 innings with Buffalo. A 47th round selection in 1999, Thayer has struck out nearly a batter per inning over the course of his nine minor league seasons.