An unpredictable winter in MLB free agency continued Thursday, as the Washington Nationals signed Edwin Jackson to a one-year deal. The team beat John Lannan in an arbitration hearing in the morning, and within hours, they added Jackson to a starting rotation that already included Stephen Strasburg, Jordan Zimmermann and new acquisition Gio Gonzalez.
Jackson, 28, is one of the hardest-throwing starters in baseball right now. In fact, no qualifying National League starter averaged hotter heat in 2011. Of course, Jackson now joins a rotation headed by Stephen Strasburg, whose fastball easily outpaces Jackson's.
Still and all, it's a good signing by the Nationals, and it gives them as formidable a front four for their starting rotation as has any team in the NL East. In fact, it elevates their starting pitching corps to the top echelon of those groups throughout the league. Here are updated power rankings for all 30 MLB teams' starting rotations in the wake of this deal.