Kim Sung-keun, manager of the defending South Korean baseball champion SK Wyverns, was fired Thursday, a day after he offered to quit at the end of the ongoing season over stalled contract negotiations. The Wyverns, based in Incheon, west of Seoul, announced Thursday that Kim will be replaced by Lee Man-soo, manager of the team's minor league team. The club said it wanted to quickly stabilize the team and prevent further distraction after Kim made an abrupt announcement Wednesday.