Johnson has struggled mightily in his first season in Oakland: 6.92 ERA, 1.22 K/BB ratio, 20 unintentional walks in 40 1/3 innings. For his career, he owns an ERA+ of 124 across parts of nine big-league seasons. Johnson was an All-Star in 2012 as a member of the Orioles.
This past offseason, the A's acquired Johnson from the Orioles in exchange for Jemile Weeks and David Freitas. Johnson is owed the balance of a $10-million contract for this season.