The Royals shook up their bullpen Monday afternoon by designating left-hander Ron Mahay for assignment and replacing him by purchasing the contract of right-hander Yasuhiko Yabuta from Class AAA Omaha.
Mahay, 38, was 1-1 with a 4.79 ERA in 41 appearances. He had allowed seven runs and 12 hits in 6 1/3 innings over his last six appearances.
Yabuta, 36, was 2-1 with a 3.55 ERA in 26 games at Omaha.
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