Kansas City, Mo. ? Rookie Rick Porcello won his fifth straight start, Placido Polanco homered and drove in three runs, and Detroit beat slumping Kansas City, 8-3.

The Tigers took two of three from the Royals, losing only to Zack Greinke, and increased their lead over K.C. in the AL Central to four games. The Royals, after a promising April and early May, have lost 13 of 18.

Bench coach John Gibbons managed the Royals while Trey Hillman served a one-game suspension imposed by Major League Baseball for accidentally spitting in the face of umpire Paul Emmel on Monday.