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The Athletics signed Floro to a minor-league contract Thursday that includes an invitation to spring training, Martin Gallegos of MLB.com reports.
Floro had a 2.06 ERA and 40:13 K:BB over 52.1 innings for Washington last season before struggling after a trade to Arizona, where he held a 9.37 ERA in 15 appearances before being released. The veteran reliever could fill a middle-relief role with the A's.