(KANSAS CITY) - When the Kansas City Royals gave starter Brad Keller the lead with a five-run third inning, Keller made sure to show his gratitude. The 23 year old took care of the White Sox batters in the top of the fourth, striking out the side on 14 pitches to get his guys back to the plate. It was just what the Royals needed to stay hot Thursday, completing a four-game sweep of the Chicago White Sox with a 6-5 win. Ian Kennedy gave up a run in the ninth, but struck out A.J. Reed looking with the tying run on second base to clinch the win and earn his 16th save in 19 opportunities. The four-game winning streak is Kansas City's longest of the season and just the Royals' second series sweep this year. Kansas City has won six of seven games since the All-Star Break. The White Sox, on the other hand, have lost seven in a row since coming back from the All-Star break and dropped a season-worst nine games under .500. Keller (6-9) got off to a rocky start, allowing the first four batters of the game to reach base on a pair of infield hits, an error and a walk, leading to a pair of unearned runs. But Keller settled down after that and battled through 6 1/3 innings, allowing just a couple of runs after the first inning. Keller gave up nine hits, struck out seven and walked two. Yoan Moncada matched his career high, set last year, with his 17th home run in the top of the third to make it 3-0 before the Royals scored. White Sox starter Ross Detwiler (1-1) lasted just 2 1/3 innings, giving up five runs and eight hits, struggling with his command from the beginning. In the four games this series, Chicago starters gave up 20 runs, 18 earned, in 19 innings and had an 8.53 ERA.