Ex-A's first baseman now in Rays camp as knuckleball pitcher

Dan Johnson hit 42 home runs for the A's in four seasons.Dan Johnson has spent the last seven seasons making brief stops in the majors as a 10-year journeyman. The last time he played over 100 games in the bigs was with the Oakland A's in 2007 as the team's first baseman.

Johnson, 36, has made stops with six different clubs, but his four years in Oakland were the longest he ever spent anywhere. Last year he played just 12 games in the pros, getting 19 at-bats for the St. Louis Cardinals.

But, Johnson is a baseball lifer and is back with a club he already played with for three years -- the Tampa Bay Rays. Only this time, there's a big change to Johnson putting on a Rays uniform.

Johnson has…