Rob Johnson appeared in 67 games for the Padres at the major-league level, serving as the backup catcher to Nick Hundley. The 28-year-old Johnson hit .190/.259/.285 while hitting three homers in 199 plate appearances. It was his first season with the Padres, after being acquired last December for future considerations from the Seattle Mariners.
Right-handed reliever Dale Thayer also elected free agency, after being removed off the 40-man roster by the New York Mets, reports Adam Rubin of ESPN. The 30-year-old posted a 2.66 ERA, 8.4 K/9, 1.9 BB/9 across 71 innings of work in 54 appearances for Class Triple-A Buffalo. He then made 11 appearances out of the bullpen for the Mets last season, allowing 4 runs to score in 10 1/3 innings while striking out five.