Following the news that Tim Byrdak has a torn anterior capsule in his left shoulder and will almost certainly require surgery, the Mets announced that Garrett Olson will be recalled from Buffalo and added to the team's active roster on Tuesday.
Olson last pitched in the big leagues during a four-and-one-third-inning stint with the Pittsburgh Pirates last year. Before that, he split time between the major and minor leagues with the Baltimore Orioles and Seattle Mariners between 2007 and 2010. In 287.1 career major-league innings, Olson has a 6.14 ERA and 5.49 FIP. He's accumulated a mediocre 6.0 K/9 but struggled with the strike zone with a 4.4 BB/9.
Olson has made 25 appearances for Triple-A Buffalo this year, 21 of which were starts, and has racked up a 4.56 ERA and 4.25 FIP in 108.2 innings. He has a 7.8 K/9 and 4.2 BB/9 for the Bisons in that time.
Olson's splits in the big leagues aren't all that encouraging for a left-handed relief pitcher. While he has fared significantly better against left-handed opponents, he still has just a 4.26 FIP against them. His walk rate has been no better against left-handed hitters, but he has struck them out more frequently than right-handed hitters.
The Mets have not yet announced the corresponding roster move to make room for Olson on the active roster, but Elvin Ramirez appears to be the most likely candidate for demotion. Olson is not on the team's 40-man roster, either, but it's safe to assume the Mets will clear a spot there by placing Byrdak on the 60-day disabled list.