The Royals are still looking for their first home win. Seattle completed a three-game sweep of Kansas City with a 10-2 win Thursday at Kauffman Stadium.The Mariners knocked Royals’ starter Denny Batista out of the game in the sixth inning. Batista gave up six runs in three-and-one-thirds innings of work.Seattle broke open a 2-2 game with six runs in the fourth inning. Jeremy Reed’s three-run double was the big hit in the inning. Richie Sexson added a two-run homer in the sixth.Mike Sweeney and David DeJesus each drove in a run for the Royals, who drop to 3-6 on the season.