BOSTON -- Mike Lowell and J.D. Drew hit grand slam homers Thursday to boost Boston past Kansas City 11-8 and give the Red Sox a four-game sweep.
Boston starter Daisuke Matsuzaka improved to 8-0 and closer Jonathan Papelbon recorded his 14th save this season.
Lowell had three hits and scored three times. Drew, whose grand slam in the bottom of the second inning erased an early 1-0 deficit, had two runs and two hits.
Kevin Youkilis and Julio Lugo both had two hits and one RBI while Dustin Pedroia drove in a run for the Red Sox, who completed a 7-0 home-stand.
Kansas City got two doubles, a three-run homer and five RBI from Miguel Olivo. Jose Guillen had four runs, three hits -- one a solo homer -- and three RBI.
Joey Gathright and David DeJesus added two hits each for the Royals, who have dropped five of six.
Losing pitcher Brian Bannister (4-6) was shelled for seven earned runs and 12 hits in 5 1/3 innings.