The Yankees have signed 30-year-old right-hander David Aardsma, Bryan Hoch of MLB.com tweets. It's a Major League deal worth $500K that includes a club option for 2013, Mark Feinsand of the New York Daily News reports. Aardsma underwent Tommy John surgery last July and won't be ready to contribute until midway through the 2012 campaign.Aardsma last pitched in the Major Leagues in 2010, when he saved 31 games as the Mariners' closer, posting a 3.44 ERA in 49 2/3 innings. He has a 4.20 ERA in parts of six MLB seasons.Keep it hear for all your Yankee news and be sure to #BYB on Twitter. --Mikey Blue, BYB Senior WriterEmail: DonnieBaseball2323@gmail.comTwitter: @MikeyBlu23Please comment, we have DISQUS, it's easier than ever. Let me know what you think and follow me on Twitter @BleednYankeeBlu...