The Padres announced on Twitter that they have designated right-hander Sean O'Sullivan for assignment to clear a roster spot for fellow righty Brad Boxberger, who will be recalled from Triple-A Tucson.
O'Sullivan, 25, signed a minor league contract with the Friars this offseason after the Blue Jays released him last November. The right-hander was drafted by the Angels and traded to the Royals along with Will Smith in exchange for Alberto Callaspo. Toronto later acquired him from Kansas City for cash considerations.
O'Sullivan posted a 3.96 ERA in 25 innings with the Padres this season but walked more batters (14) than he struck out (12) in the process. In 218 2/3 Major League innings, the San Diego native has a 5.89 ERA with 4.2 K/9, 3.6 BB/9 and a 40.1 percent ground-ball rate.
