The New York Mets purchased the contract of right-hander Tony Armas from Triple-A New Orleans on Monday night with plans to plug him into a rotation opening on Tuesday. The Mets needed an extra arm after playing a two-ballpark doubleheader against the Yankees on Friday. Mike Pelfrey was next in the rotation but he would’ve been pitching on three days’ rest, so the Mets opted to go with 13 pitchers…

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