Whose Baseball Autograph is This? Another Can’t-Miss Contest from Panini America.

For the better part of the last year we’ve watched from the front row as the Panini America product development teams have created some of the best basketball, football and hockey trading cards on the market. Finally, we get to see them work their magic on baseball.

First up on the to-do list are 2011 Donruss Elite Extra Edition and 2011 Playoff Contenders, products for which autographs began arriving in house last week, just days after the announcement that Panini America reached a multi-year trading card agreement with the Major League Baseball Players Association.

So as a fun way to keep baseball collectors informed on the progress of our newest sport’s newest products, we felt that a new baseball-only edition of the “Whose Autograph Is This?” contest was in order.

Below are nine recent autograph arrivals slated for to appear in upcoming baseball products, primarily the Sweet Signs insert in 2011 Playoff Contenders. Your mission, should you choose to accept it, is to tell us who they belong to.

We’ll give you until the end of the day Friday to get your answers in (simply leave all nine answers as one comment to this post). The person with the most correct answers will win a nice, baseball-themed prize pack from the Panini America marketing closet. In the event of a tie, two winners will be drawn at random from all eligible entries.

(Oh, and we’ll wait until the contest closes to approve all comments. No need to let everyone else see your answers beforehand.)

Got it? OK. Now, tell us, whose autographs are these?