MINNEAPOLIS -- The Twins optioned right-handed reliever Michael Tonkin to Triple-A Rochester after Wednesday's 6-1 win over the White Sox, and they will make a corresponding roster move before Friday's game in Milwaukee.
Tonkin has posted a 5.73 ERA in 16 appearances this year, with 10 strikeouts and five walks in 11 innings. He was most recently recalled on June 12, posting a 6.00 ERA in four relief outings.