The Mets have acquired minor league LHP Daniel Zamora and cash considerations from the Pirates in exchange for LHP Josh Smoker.
Smoker had been designated for assignment last week to make room on the 40-man roster for the recently re-signed Jose Reyes.
Smoker, 29, had a 5.11 ERA and 1.70 WHIP with 68 strikeouts in 56.1 innings for the Mets in 2017. He had a 4.70 ERA and 1.30 WHIP with 25 strikeouts in 15.1 innings in 2016, during what was his MLB debut.
Zamora, 24, had a 1.86 ERA with 61 strikeouts in 37 games for High-A Bradenton in 2017. He also tossed 3.0 scoreless innings for Double-A Altoona. He has posted a 2.49 ERA and 1.21 WHIP with 133 strikeouts in 115.2 innings during his three-year minor league career.
He was the Pirates' 40th-round selection out of Stony Brook in the 2015 MLB Draft, and will likely begin the 2018 season with Double-A Binghamton.
"Zamora creates a solid angle to the plate and deception, with a sweeping, sharp slider flashing as a quality pitch that he can sweet with reasonable consistency to the glove side," Baseball Prospectus wrote in their scouting report last year. "Hitters often start and stop their swing too late, or miss badly."
"He's a sinker/slider sidearmer" with a shot to be a lefty specialist pretty soon, BP's Jeffrey Paternostro tweeted on Wednesday, adding that Zamora lowered his arm slot after the above scouting report was filed, with his slider increasing in effectiveness.