The 15-year veteran went 5-1 with a 2.18 ERA in 63 appearances for Tampa Bay in 2011, but he struggled in 2012, with a 4.00 ERA. The Rays released him in August 2013, and he signed with the Pirates five days later.
Farnsworth has a 4.26 career ERA over stints with the Cubs, Tigers, Braves, Yankees, Royals, Rays and Pirates.
Cash Kruth is a reporter for MLB.com. Follow him on Twitter at @cashkruth. This story was not subject to the approval of Major League Baseball or its clubs.