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Royster managed the Las Vegas 51s from 2005 until he was fired in late September 2006. Late in 2007, Royster was signed to manage the Lotte Giants in Busan, South Korea. He is the first non-Korean to manage a KBO team. On October 13, 2010, the Lotte Giants decided not to renew Royster's contract following the Giant's defeat by the Doosan Bears in the first round of the KBO playoffs.