Vazquez, who didn't appear in a single game last season, came off of a solid 2011 season with the Marlins where he finished 13-11 with a 3.69 ERA in 192.2 innings and 32 starts.
Though the Nationals already have one of the strongest rotations in baseball led by Stephen Strasburg, Gio Gonzalez, Jordan Zimmermann, Ross Detwiler and Dan Haren, Vazquez would make a fantastic insurance option, especially with Haren's health issues from last season.
Vazquez, who does not plan to sign with a club until after he pitches for his native Puerto Rico in the upcoming World Baseball Classic in March, will only pitch for a contender according to Jim Bowden of ESPN.com.
However, the former All-Star has always pitched well in the National League, and assuming he performs well in the World Baseball Classic, he could be a very interesting addition to the Nationals rotation in 2013.
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