The 36-year-old Petit has been one of the most dependable relievers in the game over the past several years. Last season, he posted a 1.66 ERA (though his FIP was considerably higher, at 4.11), and over three seasons with Oakland has pitched to a 2.73 ERA (154 ERA+) over 180 relief appearances.
Prior to joining the A’s in 2018, Petit pitched for the Marlins, D-backs, Giants, Nationals and Angels, helping the Giants win their third World Series title in five years back in 2014. His only other postseason experience has come with the A’s — in 2019, he gave up a run over 2 2/3 innings of the American League Wild Card Game against the Rays, and last October, he struggled to a 12.46 ERA in five appearances between the AL Wild Card Series against the White Sox and the AL Division Series against the Astros.
Romo, who turns 38 on March 4, has continued to be a solid reliever after winning three World Series championships with the Giants, though he posted a 4.05 ERA over 24 appearances in the pandemic-shortened 2020 season for the Twins. He had a 3.43 ERA in 65 appearances between the Marlins and Twins in 2019, and in four seasons since leaving San Francisco, he owns a 3.76 ERA (113 ERA+) over 203 1/3 innings. He was often used as an opener during his season-plus with the Rays, for whom he had a 3.31 ERA in 98 appearances from 2017-18.